Multi-octave infrared femtosecond continuum generation in Cr:ZnS-GaSe and Cr:ZnS-ZGP tandems

Sergey Vasilyev; Viktor Smolski; Igor Moskalev; Jeremy Peppers; Mike Mirov; Yury Barnakov; Vladimir Fedorov; Dmitry Martyshkin; Andrey Muraviev; Kevin Zawilski; Peter Schunemann; Sergey Mirov; Konstantin Vodopyanov; Valentin Gapontsev

doi:10.1117/12.2543780

2 March 2020 Multi-octave infrared femtosecond continuum generation in Cr:ZnS-GaSe and Cr:ZnS-ZGP tandems

Sergey Vasilyev, Viktor Smolski, Igor Moskalev, Jeremy Peppers, Mike Mirov, Yury Barnakov, Vladimir Fedorov, Dmitry Martyshkin, Andrey Muraviev, Kevin Zawilski, Peter Schunemann, Sergey Mirov, Konstantin Vodopyanov, Valentin Gapontsev

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Proceedings Volume 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX; 1126407 (2020) https://doi.org/10.1117/12.2543780
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

We report a technique for generation of ultra-broadband coherent femtosecond continua in the infrared. The laser architecture is based on the Cr:ZnS–GaSe and Cr:ZnS–ZGP tandem arrangements that enable simultaneous amplification of ultrashort middle IR pulses and augmentation of pulses’ spectrum via a chain of intrapulse three-wave mixings. The first part of the tandems is based on a single-pass polycrystalline Cr:ZnS amplifier, which is optically pumped by off-the-shelf continuous wave Er-doped fiber laser and outputs 2-cycle pulses with multi-Watt average power at 80 MHz repetition rate, at the central wavelength 2.5 μm. The second stage of the tandems comprises a GaSe or ZGP crystals configured for intrapulse difference frequency generation. The Cr:ZnS–GaSe tandem has allowed us to achieve multi-octave 2–20 μm continuum with 2 W power in the range 2–3 μm and power in excess of 20 mW in the important range 3–20 μm. On the other hand, Cr:ZnS–ZGP tandem features long-wave infrared (6–12 μm) output pulses with record braking sub-Watt power level. Last but not least, Cr:ZnS–GaSe and Cr:ZnS–ZGP IR sources have small footprints and are easily convertible to the optical frequency combs with low carrier-to-envelope timing jitter.

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Sergey Vasilyev, Viktor Smolski, Igor Moskalev, Jeremy Peppers, Mike Mirov, Yury Barnakov, Vladimir Fedorov, Dmitry Martyshkin, Andrey Muraviev, Kevin Zawilski, Peter Schunemann, Sergey Mirov, Konstantin Vodopyanov, and Valentin Gapontsev "Multi-octave infrared femtosecond continuum generation in Cr:ZnS-GaSe and Cr:ZnS-ZGP tandems", Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 1126407 (2 March 2020); https://doi.org/10.1117/12.2543780

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