We demonstrate a first-of-its-kind efficient chirped pulse amplification of broadband mid-IR (4-5 μm) femtosecond seed pulse (230 ps, 4μJ) generated in AgGaS2 based OPA driven by Cr:forsterite laser in multi-pass Fe2+:ZnSe amplifier optically pumped by solid-state Q-switched Cr:Yb:Ho:YSGG laser (2.85 μm, 30mJ, 5Hz, 0.6 J/cm2). The system delivers 1.2 mJ at pulse duration of 230 ps. Straightforward compression to 150 fs pulse is achievable with 70% efficiency using diffraction grating pair with peak power of about 6 GW. Further non-linear compression in a bulk CaF2 due to the SPM and anomalous GVD should provide the enhancement of peak power up to 20 GW. Possible routes to reach sub-TW and even TW power level in mid-IR are discussed.
F. V. Potemkin, E. A. Migal, A. V. Pushkin, B. G. Bravy, A. A. Sirotkin, V. I. Kozlovsky, Yu. V. Korostelin, Yu. P. Podmar’kov, V. V. Firsov, M. P. Frolov, and V. M. Gordienko, "Gigawatt mid-IR (4-5 μm) femtosecond hybrid Fe2+:ZnSe laser system," Proc. SPIE 10238, High-Power, High-Energy, and High-Intensity Laser Technology III, 102380L (Presented at SPIE Optics + Optoelectronics: April 27, 2017; Published: 11 May 2017); https://doi.org/10.1117/12.2265721.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon