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30 May 2022 High-power mid-IR Cr:ZnS-based frequency combs for spectroscopy imaging and sensing
Sergey Vasilyev, Viktor Smolski, Jeremy Peppers, Igor Moskalev, Mike Mirov, Yury Barnakov, Sergey Mirov
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Proceedings Volume PC12092, Laser Technology for Defense and Security XVII; PC1209204 (2022) https://doi.org/10.1117/12.2622970
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States
Abstract
We report an approach to generation of optical frequency combs in the spectral range 2 – 20 µm. The 2-cycle, multi-Watt laser at the repetition rate 80 MHz is based on a polycrystalline Cr:ZnS. The bandwidth of the super-octave ultrafast Cr:ZnS laser source at the central wavelength 2.4 µm is extended to the long-wave IR range (5 – 20 µm) via optical rectification in non-oxide nonlinear materials: GaSe, ZGP. The key advantages of Cr:ZnS frequency comb technology is high efficiency of optical-to-optical conversion from low-cost cw EDFL light to fs MIR pulses, and ultra-low timing jitter. These advantages, in turn, has allowed us to implement shoe-box-sized, light-weight, frequency combs that open new avenues in imaging, sensing, and spectroscopy. Our preliminary evaluations confirm the applicability of the developed sources for dual-comb spectroscopy.
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Sergey Vasilyev, Viktor Smolski, Jeremy Peppers, Igor Moskalev, Mike Mirov, Yury Barnakov, and Sergey Mirov "High-power mid-IR Cr:ZnS-based frequency combs for spectroscopy imaging and sensing", Proc. SPIE PC12092, Laser Technology for Defense and Security XVII, PC1209204 (30 May 2022); https://doi.org/10.1117/12.2622970
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KEYWORDS
Frequency combs
Imaging spectroscopy
Mid-IR
Transient nonlinear optics
Long wavelength infrared
Nonlinear optics
Spectroscopy
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