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Proceedings Paper

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

Paper Details

Date Published: 2 March 2020
PDF: 12 pages
Proc. SPIE 11264, Nonlinear Frequency Generation and Conversion: Materials and Devices XIX, 1126407 (2 March 2020); doi: 10.1117/12.2543780
Show Author Affiliations
Sergey Vasilyev, Southeast Technology Ctr. (United States)
Viktor Smolski, Southeast Technology Ctr. (United States)
Igor Moskalev, Southeast Technology Ctr. (United States)
Jeremy Peppers, Southeast Technology Ctr. (United States)
Mike Mirov, Southeast Technology Ctr. (United States)
Yury Barnakov, Southeast Technology Ctr. (United States)
Vladimir Fedorov, Southeast Technology Ctr. (United States)
Univ. at Alabama at Birmingham (United States)
Dmitry Martyshkin, Southeast Technology Ctr. (United States)
Univ. of Alabama at Birmingham (United States)
Andrey Muraviev, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Kevin Zawilski, BAE Systems (United States)
Peter Schunemann, BAE Systems (United States)
Sergey Mirov, Southeast Technology Ctr. (United States)
Univ. of Alabama at Birmingham (United States)
Konstantin Vodopyanov, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Valentin Gapontsev, Southeast Technology Ctr. (United States)


Published in SPIE Proceedings Vol. 11264:
Nonlinear Frequency Generation and Conversion: Materials and Devices XIX
Peter G. Schunemann; Kenneth L. Schepler, Editor(s)

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