KEYWORDS: Femtosecond phenomena, Solid state physics, Solid state lasers, Nonlinear optics, Interfaces, Chemistry, Ytterbium, Spectroscopy, Solid state electronics, Signal to noise ratio
Studying the bulk and surface/interface properties of advanced solid-state material often requires femto- and picosecond laser pulses at wavelength ranging from the DUV to the Mid-IR region. We describe recent developments in laser technology that result in the reliable production of femtosecond pulses at 100s of kHz repetition rates. To address the variety of novel functional materials these pulses need to be tuned to sample-specific wavelength that may range from the DUV to the MIR region. In this presentation, we describe recent advances in Iaser sources and their tunable parametric amplifiers.
Multiphoton imaging typically requires a complex multi-device laser system, a large optical table, and skilled staff. This reality encumbers neuroscience and other biomedical applications. Here, we will present our direction to provide a turn-key solution for three-photon (3P) imaging. The application-optimized laser provides the anticipated reliability and simplicity but also maintains tunability in wavelength and dispersion control, which seems quite important in the current state of the application. We will explicitly dig into details of long-term power and pulse-to-pulse energy stability, and how that directly impacts your imaging results.
Ytterbium (Yb)-based femtosecond lasers have gained significant attention in recent years due to their unique combination of high average power, high pulse energy, and pulse control capabilities for both industrial and scientific applications. In this talk we will review the most recent advancements in obtaining high power infrared (IR) and ultraviolet (UV), while maintaining the stability, as well repetition rate options and wavelength extensions.
2-Photon imaging has dramatically expanded its reach in neuroscience-related applications thanks to the development of genetically encoded functional probes that report cellular activity and activates/silence individual neurons (optogenetics). The combination of 3D spatial resolution afforded by 2-photon imaging and the proliferation of advanced scanning and scanless methodologies enable powerful parallel functional imaging of thousands of individually selected neurons.
Faster and parallel imaging of large cell populations requires femtosecond lasers with higher average power and energy, but also improved pulse-to-pulse stability all along the required tuning ranges.
Light Conversion has pioneered the development of femtosecond wavelength-tunable devices as well as of high-energy and -power Ytterbium lasers ad amplifiers. In this presentation we highlight how these developments are powering advanced imaging techniques using reporting and optogenetic probes.
In this paper, an all-dielectric metasurface for surface enhanced Raman spectroscopy (SERS) is presented. The proposed design constitutes of an array of silicon (Si) dimers on top of thin film of silicon nitride (SiN), deposited on a glass substrate. The coupling mechanism between the dimers is based on two orthogonal guided waves in the SiN film. These guided modes lead to a strong separation between excitation and emitted Raman signal in the waveguide. The new design is compared to a previously published dielectric design with a gold backing mirror. The comparison takes into account manufacturability, field enhancement and thermal aspects. This shows that the all-dielectric design has about 7 times less power dissipation but the enhancement factor is about 20 times smaller.
Digital imaging has been steadily improving over the past decades and we are moving towards a wide use of multi- and hyperspectral cameras. A key component of such imaging systems are color filter arrays, which define the spectrum of light detected by each camera pixel. Hence, it is essential to develop a variable, robust and scalable way for controlling the transmission of light. Nanostructured surfaces, also known as metasurfaces, offer a promising solution as their transmission spectra can be controlled by shaping the wavelength-dependent scattering properties of their constituting elements. Here we present, metasurfaces based on silicon nanodisks, which provide filter functions with amplitudes reaching 70-90% of transmission, and well suitable for RGB and CMY color filter arrays, the initial stage towards the further development of hyperspectral filters. We suggest and discuss possible ways to expand the color gamut and improve the color values of such optical filters.
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