Dr. Alexander V. Laskin Profile

Dr. Alexander V. Laskin

at AdlOptica Optical Systems GmbH

SPIE Involvement:

Conference Program Committee | Author | Editor

Area of Expertise:

Beam Shaping , Homogenizing , Interferometry , Optical System Design , Lens Design , Laser Optics

Websites:

Company Website

Profile Summary

Dr. Alexander Laskin is a Project Manager at AdlOptica GmbH, Berlin, Germany, responsible for the project Beam Shaping Optics. A. Laskin graduated in 1990 at Bauman Moscow State Technical University and received there the PhD in 1994. His research areas relate to developing optics for ophthalmology, interferometry, various laser systems and optical instruments.

Publications (53)

Proceedings Article | 20 June 2024 Presentation + Paper

Presentation + Paper

Beam shaping of high power multimode lasers by multi-spot optics

Alexander Laskin, Joerg Volpp, Vadim Laskin, Takuji Nara, Seong Ryol Jung

Proceedings Volume 13005, 1300507 (2024) https://doi.org/10.1117/12.3014674

KEYWORDS: Beam shaping, Laser welding, Optical components, Laser optics, Multimode fibers, Beam splitters, Fiber lasers, Cladding, Additive manufacturing

Read Abstract +

Significant performance improvement of modern laser technologies such as welding, additive manufacturing, brazing, cladding, sheet metal cutting, based on the use of multi-kW multimode fiber lasers, fiber-coupled solid-state and diode lasers, can be improved using beam shaping optics providing optimal energy distribution by splitting the laser beam into several beamlets creating by further focusing separate multiple spots in the working plane and variable sharing energy between these spots. Various multi-spot patterns, such as square, line, rhombus, consisting of 4 or 9 separate spots, allow eliminating or reducing spatter, realizing optimum temperature distribution in the melt pool and stabilizing the processes in welding of tailored blanks, copper and aluminium parts in the production of batteries, zinc coated steel, cladding. Multimode lasers are characterized by low spatial coherence (large BPP or M² values), therefore the most reliable optical approach to control the intensity distribution is imaging the fiber end with a collimator and a focusing objective. The proposed multi-spot beam shaping method presents a combination of fiber end imaging and geometrical separation of focused spots perpendicular to the optical axis, thus creating a compound working spot, called as quattroXX-spot or peaXXus-spot, as a combination of several spots. Varying the energy portions in separate spots and the distances between them make it possible to optimize for a particular application common intensity distribution of the compound spot. To ensure reliable operation with multi-kW lasers and to avoid optics damage the multi-focus optical devices are designed as refractive elements with smooth optical surfaces made of optical materials self-compensating thermo-optical effects that provides insignificant thermal lensing and, hence, negligible thermal focus shift and spherical aberration. The paper presents the proposed multi-spot optics, shows intensity profile measurements and application results.

Proceedings Article | 18 June 2024 Presentation + Paper

Presentation + Paper

Multi-focus camera optics with 5˟ extending the depth of field

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 12998, 129980A (2024) https://doi.org/10.1117/12.3015558

KEYWORDS: Cameras, Modulation transfer functions, Depth of field, Image sharpness, Photography, Imaging systems, Sensors, Lenses, Machine vision

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Proceedings Article | 26 September 2023 Poster + Paper

Poster + Paper

Wavefront control with high-spatial cartridge-type piezostack deformable mirror

Vladimir Toporovsky, Ilya Galaktionov, Vadim Samarkin, Alexis Kudryashov, Alexander Panich, Anatoliy Malykhin, Alexander Laskin

Proceedings Volume 12667, 126670L (2023) https://doi.org/10.1117/12.2676879

KEYWORDS: Deformable mirrors, Wavefronts, Actuators, Mixtures, Mirror surfaces, Ferroelectric materials, Deformation, Control systems, Capacitance, Wavefront sensors

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Proceedings Article | 26 September 2023 Poster + Paper

Poster + Paper

Software and hardware implementation of the algorithm for 2-mirrors automatic laser beam alignment system

Ilya Galaktionov, Vladimir Toporovsky, Alexander Nikitin, Alexey Rukosuev, Alex Alexandrov, Julia Sheldakova, Alexander Laskin, Alexis Kudryashov

Proceedings Volume 12667, 126670I (2023) https://doi.org/10.1117/12.2676742

KEYWORDS: Near field, Automatic alignment, Wavefront sensors, Control systems, Laser systems engineering, Wavefronts, Sensors, Mirrors, Algorithm development, Reflection

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Proceedings Article | 26 September 2023 Poster + Paper

Poster + Paper

Adaptive system with Zernike-based hill-climbing algorithm for super Gaussian and doughnut-like beam shaping

Ilya Galaktionov, Alexander Nikitin, Julia Sheldakova, Vladimir Toporovsky, Alexander Laskin, Alexis Kudryashov

Proceedings Volume 12667, 126670J (2023) https://doi.org/10.1117/12.2676756

KEYWORDS: Adaptive optics, Wavefront sensors, Spatial light modulators, Wavefronts, Sensors, Light scattering, Beam shaping, Scattering media, Phase distribution, Laser scattering

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Proceedings Article | 26 September 2023 Poster + Paper

Poster + Paper

Cartridge-type piezostack deformable mirror with reduced cross-section of control elements

Vladimir Toporovsky, Ilya Galaktionov, Vadim Samarkin, Alexis Kudryashov, Alexander Panich, Anatoliy Malykhin, Alexander Laskin

Proceedings Volume 12667, 126670K (2023) https://doi.org/10.1117/12.2676744

KEYWORDS: Actuators, Deformable mirrors, Switching, Manufacturing, Control systems, Reliability, Design and modelling, Mathematical modeling, Deformation, Wavefronts

Read Abstract +

Proceedings Article | 4 March 2022 Presentation + Paper

Presentation + Paper

Diffraction limited high NA focusing in transparent media at depth up to 4 mm

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 11989, 1198905 (2022) https://doi.org/10.1117/12.2607938

KEYWORDS: Monochromatic aberrations, Glasses, Silica, Diffraction, Objectives, Pulsed laser operation, Optical design, Wavefront aberrations, Silicon carbide, Geometrical optics

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Proceedings Article | 4 March 2022 Presentation + Paper

Presentation + Paper

On the selection of materials for high-power laser optics with reduced thermal lensing

Alexander Laskin, Joerg Volpp

Proceedings Volume 11994, 1199408 (2022) https://doi.org/10.1117/12.2607931

KEYWORDS: Thermography, Crystals, Optical components, Quartz, Sapphire, Refractive index, Lenses, High power lasers, Glasses, Wavefront aberrations

Read Abstract +

SPIE Journal Paper | 17 November 2021

On the selection of materials for high-power laser optics based on analysis of focus shift and aberration induced by thermal gradient

Alexander Laskin

OE, Vol. 60, Issue 11, 115105, (November 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.11.115105

KEYWORDS: Thermography, Adaptive optics, Optical components, Laser optics, High power lasers, Crystals, Refractive index, Thermal effects, Quartz, Optical engineering

Read Abstract +

Proceedings Article | 4 March 2019 Presentation

Presentation

Beam shaping of high pulse energy lasers (Conference Presentation)

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 10899, 108990V (2019) https://doi.org/10.1117/12.2507619

KEYWORDS: Beam shaping, Pulsed laser operation, Laser energy, Imaging systems, High power lasers, Laser applications, Laser optics, Lenses, Optical imaging, Ultrafast phenomena

Read Abstract +

High-power pulsed lasers are widely used in scientific and industrial applications, and control of irradiance distribution using beam shaping optics is important to increase efficiency of laser techniques. A popular approach of building optical systems is use of a refractive beam shaper and imaging optics afterwards to create resulting spot of required intensity profile and size in a working plane. Important feature of imaging optical systems is creating the image after the paraxial focal plane – this means focusing of a high energy pulse before the image plane and probable air break down disturbing the intensity distribution in image and reducing performance of entire system. This problem becomes especially actual with modern ultrashort pulse lasers which pulse energy is constantly rising. Specific requirements to beam shaping optics in these laser systems are providing variable irradiance distributions, saving of beam consistency and flatness of phase front, capability to work with TEM00 and multimode lasers, resistance to high peak power radiation. Among various refractive and diffractive beam shaping techniques only refractive field mapping beam shapers like piShaper meet these requirements. The operational principle of these devices presumes almost lossless transformation of laser beam irradiance from Gaussian to flat-top, super-Gauss or inverse-Gauss through controlled wavefront manipulation inside a beam shaper using lenses with smooth optical surfaces. To overcome the problem of eventual air break down by imaging after a beam shaper it is suggested to apply optical systems with field lenses, which main function is changing the focusing conditions without change of the system transverse magnification. This approach allows to “move” the point of pulse energy concentration from the image zone and increase the focus spot size in order to reduce probability of air break down or avoid it at all. This paper will describe some design basics of refractive beam shapers of the field mapping type and optical layouts of their applying in optical systems of high-power lasers. Examples of real implementations and experimental results will be presented as well.

Proceedings Article | 18 September 2018 Paper

Paper

Acousto-optic infrared imaging spectrometer for close-up sensing of planetary surfaces

Denis Belyaev, Konstantin Yushkov, Sergey Anikin, Yuri Dobrolenskiy, Alexander Laskin, Vladimir Ya. Molchanov, Sergey Potanin, Oleg Korablev, Oleg Makarov, Sergey Mantsevich

Proceedings Volume 10765, 107650H (2018) https://doi.org/10.1117/12.2320487

KEYWORDS: Polarization, Infrared imaging, Spectroscopy, Acousto-optics, Infrared spectroscopy, Imaging systems

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Proceedings Article | 26 February 2018 Presentation + Paper

Presentation + Paper

Optics to control thermal effects in selective laser melting

Alexander Laskin, Dietrich Faidel, Vadim Laskin

Proceedings Volume 10523, 1052319 (2018) https://doi.org/10.1117/12.2289683

KEYWORDS: Thermal effects, Beam shaping, Silica, Glasses, Optical components, Laser applications, Geometrical optics

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Proceedings Article | 20 February 2018 Presentation + Paper

Presentation + Paper

Beam shaping optics to enhance performance of interferometry techniques in grating manufacture

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 10513, 105130F (2018) https://doi.org/10.1117/12.2287528

KEYWORDS: Beam shaping, Diffraction, Interferometry, Holography, Imaging systems, Spatial filters, Transmission electron microscopy, Particles, Optics manufacturing, Collimation

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Proceedings Article | 15 February 2018 Presentation + Paper

Presentation + Paper

Beam shaping of focused radiation of multimode lasers

Alexander Laskin, Joerg Volpp, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 10525, 1052507 (2018) https://doi.org/10.1117/12.2287980

KEYWORDS: Beam shaping, Laser cutting, Fiber lasers, Laser energy, Multimode fibers, Collimators, Laser welding, Objectives, Beam splitters, Metals

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Proceedings Article | 15 February 2018 Presentation + Paper

Presentation + Paper

Influence of thermally induced aberrations on resulting intensity distribution

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 10525, 1052506 (2018) https://doi.org/10.1117/12.2289174

KEYWORDS: Thermal effects, Geometrical optics, Optical components, Glasses, Laser applications, Contamination, Monochromatic aberrations, Refractive index

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Proceedings Article | 25 August 2017 Presentation + Paper

Presentation + Paper

Multi-focus beam shaping of high power multimode lasers

Alexander Laskin, Joerg Volpp, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 10347, 103470N (2017) https://doi.org/10.1117/12.2273494

KEYWORDS: Beam shaping, Laser cutting, Fiber coupled lasers, High power lasers, Multimode fibers, Laser welding, Cladding, Laser applications

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Proceedings Article | 22 February 2017 Presentation + Paper

Presentation + Paper

Optics for multimode lasers with elongated depth of field

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 10085, 100850K (2017) https://doi.org/10.1117/12.2249535

KEYWORDS: Laser cutting, High power lasers, Laser optics, Laser welding, Metals, Laser applications, Fiber lasers, Packaging, Beam shaping, Multimode fibers, Objectives, Beam splitters, Optical design

Read Abstract +

Proceedings Article | 27 September 2016 Presentation + Paper

Presentation + Paper

Refractive beam shapers for focused laser beams

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9950, 995002 (2016) https://doi.org/10.1117/12.2235712

KEYWORDS: Beam shaping, Micromachining, Pulsed laser operation, Laser drilling, Diamond, Laser applications, Diffraction, Beam analyzers, Gaussian beams, Laser ablation

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Proceedings Article | 13 May 2016 Paper

Paper

Beam shaping to provide round and square-shaped beams in optical systems of high-power lasers

Alexander Laskin, Vadim Laskin

Proceedings Volume 9834, 98340B (2016) https://doi.org/10.1117/12.2218620

KEYWORDS: Beam shaping, Pulsed laser operation, Free electron lasers, High power lasers, Beam controllers, Solid state lasers, Optical pumping, Crystal optics, Diffraction, Imaging systems

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Proceedings Article | 27 April 2016 Paper

Paper

Laser beam shaping for biomedical microscopy techniques

Alexander Laskin, Peter Kaiser, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9887, 98872E (2016) https://doi.org/10.1117/12.2217927

KEYWORDS: Beam shaping, Confocal microscopy, Microscopy, Microscopes, Luminescence, Laser induced fluorescence, Biomedical optics, Confocal fluorescent microscopy, Imaging systems, Objectives, Collimation, Microlens array, Image processing, Telescopes

Read Abstract +

Uniform illumination of a working field is very important in optical systems of confocal microscopy and various implementations of fluorescence microscopy like TIR, SSIM, STORM, PALM to enhance performance of these laser-based research techniques. Widely used TEM₀₀ laser sources are characterized by essentially non-uniform Gaussian intensity profile which leads usually to non-uniform intensity distribution in a microscope working field or in a field of microlenses array of a confocal microscope optical system, this non-uniform illumination results in instability of measuring procedure and reducing precision of quantitative measurements. Therefore transformation of typical Gaussian distribution of a TEM₀₀ laser to flat-top (top hat) profile is an actual technical task, it is solved by applying beam shaping optics. Due to high demands to optical image quality the mentioned techniques have specific requirements to a uniform laser beam: flatness of phase front and extended depth of field, - from this point of view the microscopy techniques are similar to holography and interferometry. There are different refractive and diffractive beam shaping approaches used in laser industrial and scientific applications, but only few of them are capable to fulfil the optimum conditions for beam quality required in discussed microscopy techniques. We suggest applying refractive field mapping beam shapers πShaper, which operational principle presumes almost lossless transformation of Gaussian to flat-top beam with flatness of output wavefront, conserving of beam consistency, providing collimated low divergent output beam, high transmittance, extended depth of field, negligible wave aberration, and achromatic design provides capability to work with several lasers with different wavelengths simultaneously. The main function of a beam shaper is transformation of laser intensity profile, further beam transformation to provide optimum for a particular technique spot size and shape has to be realized by an imaging optical system which can include microscope objectives and tube lenses. This paper will describe design basics of refractive beam shapers and optical layouts of their applying in microscopy systems. Examples of real implementations and experimental results will be presented as well.

Proceedings Article | 25 August 2015 Paper

Paper

Square shaped flat-top beam in refractive beam shapers

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9581, 95810K (2015) https://doi.org/10.1117/12.2186247

KEYWORDS: Beam shaping, Crystal optics, Crystals, Polarization, Birefringence, Laser crystals, Lenses, Optical components, Geometrical optics, Refractive index

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Proceedings Article | 9 March 2015 Paper

Paper

Generation of doughnut spot for high-power laser technologies using refractive beam shaping

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9356, 935609 (2015) https://doi.org/10.1117/12.2081455

KEYWORDS: Beam shaping, Semiconductor lasers, Fiber coupled lasers, Fiber lasers, Multimode fibers, Laser applications, Collimation, Solid state lasers, Optical components, High power lasers

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Proceedings Article | 26 February 2015 Paper

Paper

Freeform beam shaping in optical systems of high-power lasers

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9345, 93450J (2015) https://doi.org/10.1117/12.2080838

KEYWORDS: Beam shaping, High power lasers, Crystals, Laser crystals, Pulsed laser operation, Optical pumping, Lenses, Laser systems engineering, Diffraction, Optical components

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Proceedings Article | 20 February 2015 Paper

Paper

Refractive beam shapers for optical systems of lasers

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9346, 93460R (2015) https://doi.org/10.1117/12.2080864

KEYWORDS: Beam shaping, Pulsed laser operation, Free electron lasers, Crystals, Laser crystals, High power lasers, Optical pumping, Laser optics, Lenses, Laser systems engineering

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Proceedings Article | 20 February 2015 Paper

Paper

Building beam shaping optics for micromachining

Alexander Laskin, Valdemaras Juzumas, Aivaras Urniežius, Vadim Laskin, Gintas Šlekys, Aleksei Ostrun

Proceedings Volume 9346, 934615 (2015) https://doi.org/10.1117/12.2081171

KEYWORDS: Beam shaping, Imaging systems, Mirrors, Collimators, Lenses, Micromachining, Optical components, Laser applications, Head, Laser drilling

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Proceedings Article | 25 September 2014 Paper

Paper

Building achromatic refractive beam shapers

Alexander Laskin, David Shealy

Proceedings Volume 9194, 91940R (2014) https://doi.org/10.1117/12.2061343

KEYWORDS: Beam shaping, Colorimetry, Glasses, Aspheric lenses, Laser applications, Optical design, Silica, Lens design, Optical design software, Chromatic aberrations

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Proceedings Article | 25 September 2014 Paper

Paper

Designing refractive beam shapers via aberration theory

Alexander Laskin, David Shealy

Proceedings Volume 9194, 91940T (2014) https://doi.org/10.1117/12.2063388

KEYWORDS: Aspheric lenses, Beam shaping, Aberration theory, Optical design, Lenses, Ray tracing, Silica, Chromatic aberrations, Spherical lenses, Monochromatic aberrations

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Proceedings Article | 5 September 2014 Paper

Paper

Beam shaping for holographic techniques

Alexander Laskin, Vadim Laskin, Aleksei Ostrun

Proceedings Volume 9200, 92000E (2014) https://doi.org/10.1117/12.2061222

KEYWORDS: Beam shaping, Holography, Spatial light modulators, Imaging systems, Holographic interferometry, Computer generated holography, Interferometry, Digital micromirror devices, Diffraction, Data storage

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Proceedings Article | 4 March 2014 Paper

Paper

Intra-cavity metamorphosis of a Gaussian beam to flat-top distribution

Darryl Naidoo, Igor Litvin, Alexander Laskin, Andrew Forbes

Proceedings Volume 8960, 89601H (2014) https://doi.org/10.1117/12.2039106

KEYWORDS: Gaussian beams, Mirrors, Spatial light modulators, Laser resonators, Optical components, Beam propagation method, Chemical elements, Beam shaping, Optical design, Solid state lasers

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Proceedings Article | 4 March 2014 Paper

Paper

Freeform beam shaping for high-power multimode lasers

Alexander Laskin, Vadim Laskin

Proceedings Volume 8960, 89601P (2014) https://doi.org/10.1117/12.2037007

KEYWORDS: Beam shaping, Fiber lasers, Multimode fibers, Semiconductor lasers, Collimation, Laser processing, Fiber coupled lasers, Solid state lasers, High power lasers, Optical components

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Proceedings Article | 28 September 2013 Paper

Paper

Beam shaping unit for micromachining

Alexander Laskin, Nerijus Šiaulys, Gintas Šlekys, Vadim Laskin

Proceedings Volume 8843, 88430G (2013) https://doi.org/10.1117/12.2025985

KEYWORDS: Beam shaping, Imaging systems, Pulsed laser operation, Laser applications, Collimation, Micromachining, Collimators, Fiber coupled lasers, Semiconductor lasers, Solid state lasers

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Proceedings Article | 28 September 2013 Paper

Paper

Beam shaping to generate uniform laser light sheet and linear laser spots

Alexander Laskin, Vadim Laskin

Proceedings Volume 8843, 88430C (2013) https://doi.org/10.1117/12.2021459

KEYWORDS: Beam shaping, Imaging systems, Collimation, Lenses, Diffraction, Focus stacking, Gaussian beams, Optical components, Laser applications, Prisms

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Proceedings Article | 16 September 2013 Paper

Paper

Beam shaping imaging system for laser microprocessing with scanning optics

Alexander Laskin, Nerijus Šiaulys, Gintas Šlekys, Vadim Laskin

Proceedings Volume 8826, 88260F (2013) https://doi.org/10.1117/12.2026862

KEYWORDS: Beam shaping, Imaging systems, Collimators, Head, Laser applications, Mirrors, Optics manufacturing, Scanners, Optical components, Diffraction

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Proceedings Article | 5 March 2013 Paper

Paper

Beam shaping to improve holography techniques based on spatial light modulators

Alexander Laskin, Vadim Laskin

Proceedings Volume 8642, 86420I (2013) https://doi.org/10.1117/12.2001399

KEYWORDS: Beam shaping, Holography, Diffraction, Spatial light modulators, Spatial filters, Imaging systems, Computer generated holography, Optical design, Digital micromirror devices, Collimation

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Proceedings Article | 1 March 2013 Paper

Paper

Collimating beam shaper for holography and interferometry

Alexander Laskin, Vadim Laskin

Proceedings Volume 8644, 864406 (2013) https://doi.org/10.1117/12.2006540

KEYWORDS: Beam shaping, Holography, Diffraction, Interferometry, Spatial filters, Collimation, Imaging systems, Holographic interferometry, Optical design, Particles

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Proceedings Article | 22 February 2013 Paper

Paper

Refractive beam shapers for material processing with high power single mode and multimode lasers

Alexander Laskin, Vadim Laskin

Proceedings Volume 8600, 860010 (2013) https://doi.org/10.1117/12.2001390

KEYWORDS: Beam shaping, Collimation, Laser applications, Fiber lasers, Fiber coupled lasers, Laser processing, Semiconductor lasers, Multimode fibers, Imaging systems, Solid state lasers

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Proceedings Article | 24 October 2012 Paper

Paper

Apodization of the incident light beam by an optimized quasi-Gaussian profile shifted along an aperture of the acousto-optical cell with appreciable acoustic losses

Alexandre Shcherbakov, Alexander Laskin, Ana Virginia Hanessian de la Garza

Proceedings Volume 8412, 84121C (2012) https://doi.org/10.1117/12.2001404

KEYWORDS: Acoustics, Signal attenuation, Apodization, Fourier transforms, Acousto-optics, Light scattering, Statistical analysis, Phonons, High dynamic range imaging, Crystals

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Proceedings Article | 19 October 2012 Paper

Paper

Applying field mapping refractive beam shapers to improve irradiation of photocathode of FEL

Alexander Laskin, Vadim Laskin

Proceedings Volume 8504, 85040N (2012) https://doi.org/10.1117/12.930274

KEYWORDS: Beam shaping, Free electron lasers, Laser systems engineering, Pulsed laser operation, Crystals, Laser crystals, High power lasers, Optical components, Imaging systems, Nd:YAG lasers

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Proceedings Article | 15 October 2012 Paper

Paper

Imaging techniques with refractive beam shaping optics

Alexander Laskin, Vadim Laskin

Proceedings Volume 8490, 84900J (2012) https://doi.org/10.1117/12.930284

KEYWORDS: Beam shaping, Imaging systems, Holography, Laser applications, Lenses, Interferometry, Optical imaging, Collimators, Diffraction, Collimation

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Proceedings Article | 12 October 2012 Paper

Paper

Applying field mapping refractive beam shapers in laser technologies for solar energy

Alexander Laskin, Vadim Laskin

Proceedings Volume 8473, 84730O (2012) https://doi.org/10.1117/12.930303

KEYWORDS: Beam shaping, Laser applications, Imaging systems, Optics manufacturing, Lenses, Solar cells, Collimation, Geometrical optics, Collimators, Optical components

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Proceedings Article | 16 May 2012 Paper

Paper

Applying refractive beam shapers for spectral beam combining with volume Bragg gratings

Alexander Laskin, Derrek Drachenberg, Sergiy Mokhov, George Venus, Leonid Glebov, Vadim Laskin

Proceedings Volume 8433, 84330L (2012) https://doi.org/10.1117/12.922893

KEYWORDS: Beam shaping, Fiber Bragg gratings, Distortion, Gaussian beams, Optical components, Thermal effects, Fiber lasers, Mirrors, Reflectivity, Laser sources

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The technique of combining the laser beams with proximate wavelengths by a train of volume Bragg gratings operating as narrow band spectral mirrors allows reaching extremely high resulting power. Performance of these volume Bragg gratings in terms of reflectivity, stability of spectral characteristics depends on their temperature, especially on the temperature profile being a result of interaction of the incident or passing through radiation of powerful laser with material of the grating. The most dangerous effect of thermal lensing appears as a result of heating by laser radiation. The temperature profile in a grating is determined by the intensity profile of a laser beam applied, conditions of thermal conductivity, and energy exchange with environment. The Gaussian intensity distribution in typical laser beams leads to higher temperature in the central part of a grating and, hence, causes nonuniform shift of Bragg wavelength across the aperture and thermal lensing. Homogenizing of the temperature profile over the working field of a volume Bragg grating would mitigate radial gradient of temperature and increase brightness of a combined beam. This can be realized through applying the beam shaping optics, for example refractive field mapping beam shapers. They provide high flexibility in building various optical setups due to their unique features: almost lossless intensity profile transformation, providing flattop, super-Gauss or inverse Gauss profiles. Different profile shapes can be achieved with the same beam shaper, saving of the beam consistency, high transmittance and flatness of intensity profile, extended depth of field, capability to adapt to real intensity profiles of TEM₀₀ and multimode laser sources. Combining of the refractive field mapping beam shapers with other optical components, like beam-expanders, relay imaging lenses, anamorphic optics makes it possible to generate the laser spots of necessary shape, size and intensity distribution. This paper describes a comparison of quality (M²) of Gaussian and super-Gaussian beams diffracted and transmitted by reflecting volume Bragg gratings used for spectral beam combining. Both, mathematical modelling of thermal lensing and experimental results with high density spectral beam combining of 150 W laser beams are described. It was found that the use of super-Gaussian beams results in smaller gradient of temperature across the aperture and, therefore, smaller thermal lensing.

Proceedings Article | 15 May 2012 Paper

Paper

Beam shaping in high-power laser systems with using refractive beam shapers

Alexander Laskin, Vadim Laskin

Proceedings Volume 8433, 84330N (2012) https://doi.org/10.1117/12.920002

KEYWORDS: Beam shaping, High power lasers, Crystals, Laser crystals, Free electron lasers, Pulsed laser operation, Laser applications, Optical components, Nd:YAG lasers, Laser systems engineering

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Beam Shaping of the spatial (transverse) profile of laser beams is highly desirable by building optical systems of high-power lasers as well in various applications with these lasers. Pumping of the crystals of Ti:Sapphire lasers by the laser radiation with uniform (flattop) intensity profile improves performance of these ultrashort pulse high-power lasers in terms of achievable efficiency, peak-power and stability, output beam profile. Specifications of the solid-state lasers built according to MOPA configuration can be also improved when radiation of the master oscillator is homogenized and then is amplified by the power amplifier. Features of building these high power lasers require that a beam shaping solution should be capable to work with single mode and multimode beams, provide flattop and super-Gauss intensity distributions, the consistency and divergence of a beam after the intensity re-distribution should be conserved and low absorption provided. These specific conditions are perfectly fulfilled by the refractive field mapping beam shapers due to their unique features: almost lossless intensity profile transformation, low output divergence, high transmittance and flatness of output beam profile, extended depth of field, adaptability to real intensity profiles of TEM00 and multimode laser sources. Combining of the refractive field mapping beam shapers with other optical components, like beam-expanders, relay imaging lenses, anamorphic optics makes it possible to generate the laser spots of necessary shape, size and intensity distribution. There are plenty of applications of high-power lasers where beam shaping bring benefits: irradiating photocathode of Free Electron Lasers (FEL), material ablation, micromachining, annealing in display making techniques, cladding, heat treating and others. This paper will describe some design basics of refractive beam shapers of the field mapping type, with emphasis on the features important for building and applications of high-power laser sources. There will be presented results of applying the refractive beam shapers in real installations.

Proceedings Article | 15 May 2012 Paper

Paper

Refractive beam shaping optics to improve operation of spatial light modulators

Alexander Laskin, Vadim Laskin

Proceedings Volume 8395, 83950J (2012) https://doi.org/10.1117/12.920521

KEYWORDS: Beam shaping, Computer generated holography, Spatial light modulators, Digital micromirror devices, Holography, Lithography, Collimation, Laser applications, Microscopes, Wavefronts

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Proceedings Article | 7 May 2012 Paper

Paper

Beam combining with using beam shaping

Alexander Laskin, Derrek Drachenberg, Sergey Mokhov, George Venus, Leonid Glebov, Vadim Laskin

Proceedings Volume 8381, 83811K (2012) https://doi.org/10.1117/12.920515

KEYWORDS: Beam shaping, Distortion, Fiber Bragg gratings, High power lasers, Gaussian beams, Optical components, Thermal effects, Absorption, Fiber lasers, Transmittance

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Proceedings Article | 10 February 2012 Paper

Paper

Applying field mapping refractive beam shapers to improve holographic techniques

Alexander Laskin, Gavin Williams, Richard McWilliam, Vadim Laskin

Proceedings Volume 8281, 82810K (2012) https://doi.org/10.1117/12.903615

KEYWORDS: Beam shaping, Holography, Wavefronts, Collimation, Transmittance, Focus stacking, Laser sources, Computer generated holography, Computer security, Holograms

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Proceedings Article | 7 February 2012 Paper

Paper

Variable beam shaping with using the same field mapping refractive beam shaper

Alexander Laskin, Vadim Laskin

Proceedings Volume 8236, 82360D (2012) https://doi.org/10.1117/12.903606

KEYWORDS: Beam shaping, Laser applications, Apodization, Optical design, Gaussian beams, Point spread functions, Collimation, Solid state lasers, Signal attenuation, Acoustics

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Proceedings Article | 21 October 2011 Paper

Paper

Characterization of the optical sub-system in an advanced prototype of a new acousto-optical spectrometer for the Mexican Large Millimeter Telescope

Alexandre Shcherbakov, Daniel Sanchez Lucero, Alexander Laskin

Proceedings Volume 8011, 801113 (2011) https://doi.org/10.1117/12.902220

KEYWORDS: Polarization, Beam expanders, Prisms, Spectroscopy, Apodization, Prototyping, Thulium, Tellurium, Crystals, Jones vectors

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Proceedings Article | 21 October 2011 Paper

Paper

Developing the refractive light beam shapers as lossless apodization systems suppressing the side-lobes in Fourier transform optical systems

Alexander Laskin, Alexandre Shcherbakov, Vladimir Molchanov, Vadim Laskin, Oleg Makarov

Proceedings Volume 8011, 80110L (2011) https://doi.org/10.1117/12.901944

KEYWORDS: Beam shaping, Apodization, Point spread functions, Imaging systems, Fourier transforms, Spectrum analysis, Diffraction, Optical imaging, Acousto-optics, Beam analyzers

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Proceedings Article | 19 February 2011 Paper

Paper

Applying of refractive beam shapers of circular symmetry to generate non-circular shapes of homogenized laser beams

Alexander Laskin, Vadim Laskin

Proceedings Volume 7913, 79130J (2011) https://doi.org/10.1117/12.881719

KEYWORDS: Beam shaping, Prisms, Optical components, Laser applications, Collimation, Fiber lasers, Lenses, Flow cytometry, Cladding, Annealing

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Proceedings Article | 16 August 2010 Paper

Paper

Applying refractive beam shapers to improve other beam shaping techniques

Alexander Laskin, Gavin Williams, Richard McWilliam, Vadim Laskin

Proceedings Volume 7789, 778907 (2010) https://doi.org/10.1117/12.858646

KEYWORDS: Beam shaping, Computer generated holography, Digital micromirror devices, Spatial light modulators, Collimation, Holography, Lithography, Microscopes, Laser applications, Confocal microscopy

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Proceedings Article | 18 February 2010 Paper

Paper

Applying refractive beam shapers in creating spots of uniform intensity and various shapes

Alexander Laskin, Gavin Williams, Alexander Demidovich

Proceedings Volume 7579, 75790N (2010) https://doi.org/10.1117/12.841289

KEYWORDS: Beam shaping, Relays, Collimation, Laser applications, Free electron lasers, Digital micromirror devices, Zoom lenses, Imaging systems, Fiber lasers, Optical components

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Proceedings Article | 22 August 2009 Paper

Paper

Achromatic refractive beam shaping optics for broad spectrum laser applications

Alexander Laskin

Proceedings Volume 7430, 743003 (2009) https://doi.org/10.1117/12.828521

KEYWORDS: Beam shaping, Lenses, Laser applications, Free electron lasers, Femtosecond phenomena, Nd:YAG lasers, Optical design, Pulsed laser operation, Aspheric lenses, Collimation

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Proceedings Article | 24 June 1993 Paper

Paper

Keratoscope: a device for noncontact measuring the shape of the anterior corneal surface of the human eye

Daniil Puryayev, Alexander Laskin

Proceedings Volume 1877, (1993) https://doi.org/10.1117/12.147521

KEYWORDS: Eye, Cornea, Algorithm development, Reflection, Optical design, Collimators, Mirrors, Geometrical optics, Measurement devices, Ions

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Showing 5 of 53 publications

Proceedings Volume Editor (6)

SPIE Conference Volume | 20 October 2023

Laser Beam Shaping XXIII

SPIE Conference Volume | 19 October 2022

Laser Beam Shaping XXII

SPIE Conference Volume | 24 August 2021

Laser Beam Shaping XXI

SPIE Conference Volume | 15 September 2020

Laser Beam Shaping XX

SPIE Conference Volume | 4 October 2019

Laser Beam Shaping XIX

Showing 5 of 6 publications

Conference Committee Involvement (21)

Novel Optical Systems, Methods, and Applications XXVII

19 August 2024 | San Diego, California, United States

Components and Packaging for Laser Systems X

29 January 2024 | San Francisco, California, United States

Laser Beam Shaping XXIII

21 August 2023 | San Diego, California, United States

Components and Packaging for Laser Systems IX

30 January 2023 | San Francisco, California, United States

Laser Beam Shaping XXII

23 August 2022 | San Diego, California, United States

Components and Packaging for Laser Systems VIII

24 January 2022 | San Francisco, California, United States

Laser Beam Shaping XXI

1 August 2021 | San Diego, California, United States

Components and Packaging for Laser Systems VII

6 March 2021 | Online Only, California, United States

Laser Beam Shaping XX

24 August 2020 | Online Only, California, United States

Components and Packaging for Laser Systems VI

3 February 2020 | San Francisco, California, United States

Laser Beam Shaping XIX

11 August 2019 | San Diego, California, United States

Components and Packaging for Laser Systems V

4 February 2019 | San Francisco, California, United States

Laser Beam Shaping XVIII

20 August 2018 | San Diego, California, United States

Components and Packaging for Laser Systems IV

30 January 2018 | San Francisco, California, United States

Components and Packaging for Laser Systems III

31 January 2017 | San Francisco, California, United States

Laser Beam Shaping XVII

29 August 2016 | San Diego, California, United States

Components and Packaging for Laser Systems II

16 February 2016 | San Francisco, California, United States

Laser Beam Shaping XVI

10 August 2015 | San Diego, California, United States

Components and Packaging for Laser Systems

9 February 2015 | San Francisco, California, United States

Laser Beam Shaping XV

17 August 2014 | San Diego, California, United States

Laser Beam Shaping XIV

26 August 2013 | San Diego, California, United States

Showing 5 of 21 Conference Committees

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