We present a stimulated Raman scattering (SRS) microscope integrated with a novel fiber-based light source. Our light source provides two synchronized pulse trains with 100 mW average power each, independently tunable in the range of 913 to 930 nm and 1024 to 1034 nm, respectively, thus enabling SRS measurements across the 990 to 1300 cm-1 spectral range with a spectral resolution of 15 cm-1. We demonstrate the SRS imaging of leukemic cells recorded in a few seconds. Our system may find potential application in biomedicine, in particular, helping to accelerate the diagnostics and follow-up treatment of leukemia patients.
Chirped fiber Bragg gratings opened up a way towards investigating dispersion-managed dissipative soliton regime in all-fiber cavities at the wavelength of 1 µm. It has been shown that dispersion management can decrease the chirped pulse duration compared to all-normal-dispersion oscillators. Recent works also prove that operation near-zero net cavity dispersion can reduce the relative intensity noise. Building such systems using only polarization-maintaining optical fibers is of great interest because of their robustness in extreme environmental conditions resulting in various applications outside research laboratories. This work presents an ultrafast Ybdoped fiber laser oscillator made entirely of polarization-maintaining optical fibers and fiberized components. Unlike in typical ring cavities, the ultrashort pulse passes through the rare-earth-doped fiber twice per cavity roundtrip. The system operates in a Raman-free dispersion-managed dissipative soliton regime at the central wavelength of 1031 nm. The negative dispersion is introduced to the cavity via a chirped fiber Bragg grating. At net cavity dispersion of –0.037 ps2, the setup delivers stable 3 nJ pulses at a repetition rate of 23.781 MHz. The oscillator, passively mode-locked with a nonlinear optical loop mirror, generates positively chirped 8.2 ps pulses, which can be compressed down to 125 fs with a temporal Strehl ratio of 0.77.
Plasmonic nanostructures can efficiently absorb and scatter light, and thus exhibit vibrant colors. Colors originate from the excitation of plasmon resonances – collective oscillations of free electrons in metallic nanoparticles. Semicontinuous metal films (SMF) are a special type of disordered plasmonic structures that can be mass-produced in a rather inexpensive physical vapor deposition process. SMFs are comprised of random in their nature nano-island structures of various sizes and shapes resonating at different wavelengths. When irradiated with high-intensity laser radiation, the nanostructures can be locally modified. Spatially local restructuring originates from highly localized SMF absorption of light in hotspots, regions of a high local electric field. Thus, the optical response of the film can be altered in a spectrally selective manner. Hence, locally different colors are obtained. In this work, we demonstrate the generation of structural plasmonic colors through femtosecond laser-induced modification of thin semicontinuous aluminum films deposited on an aluminum mirror coated with an isolator layer. The structures show vivid colors in reflection. The effects of laser parameters on final color are explored. In addition, we report laser-induced control of diffuse reflectance of aluminum SMF structures. Self-passivation effect of aluminum results in the long-term stability of generated colors.
We present the first all-polarization-maintaining Ytterbium-doped fiber laser oscillator mode-locked through a nonlinear optical loop mirror that works in a dispersion-managed dissipative soliton regime. Using a chirped fiber Bragg grating, we built a cavity of a net negative dispersion delivering ultrashort 2.3 nJ pulses at a repetition rate of 34.08 MHz. Chirped 3.96 ps pulses from the oscillator are recompressible down to 98 fs with a high temporal Strehl ratio.
In this work, we present an all-polarization-maintaining, all-large-mode-area fiber laser oscillator passively mode-locked using a nonlinear optical loop mirror. The ytterbium-doped system, working in a Raman-free regime, operates at a central wavelength of 1.03 μ;m. The oscillator emits 12 nJ pulses at a repetition rate of 7.56 MHz. Positively chirped pulses from an all-normal-dispersion cavity can be externally compressed to the duration of 250 fs.
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