This paper summarizes recent improvements of output characteristics of polycrystalline Cr:ZnS/Se master oscillators in Kerr-Lens-Mode-Locked regime. We developed a flexible design of femtosecond polycrystalline Cr:ZnS and Cr:ZnSe lasers and amplifiers in the spectral range 2–3 μm. We obtained few-optical-cycle pulses with multi-Watt average power in very broad range of repetition rates 0.08–1.2 GHz. We also report on efficient nonlinear frequency conversion directly in the polycrystalline gain elements of ultra-fast lasers and amplifiers. In this work we also report on recent progress in spinning ring gain element technology and report to the best of our knowledge the highest output power of 9.2 W Fe:ZnSe laser operating in CW regime at 4150nm.
Sergey Vasilyev, Igor Moskalev, Mike Mirov, Viktor Smolski, Dmitry Martyshkin, Vladimir Fedorov, Sergey Mirov, and Valentin Gapontsev, "Progress in Cr and Fe doped ZnS/Se mid-IR CW and femtosecond lasers," Proc. SPIE 10193, Ultrafast Bandgap Photonics II, 101930U (Presented at SPIE Defense + Security: April 11, 2017; Published: 8 May 2017); https://doi.org/10.1117/12.2264209.
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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