6 March 2013 1 Watt femtosecond mid-IR Cr:ZnS laser
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A room-temperature Kerr-Lens modelocked (KLM) Cr:ZnS laser generates <70 fs pulses duration (about eight optical cycles) with 5.6 nJ pulse energy and over 100 nm FWHM spectral width at 105-157 MHz repetition rates. The laser produces 1 W average output power at 20% optical efficiency, limited by the available Er:fiber pump. For further pulse energy scaling we also realized the chirped-pulse regime, with 0.8-2 ps pulse durations. The demonstrated applications of such mid-IR source range from extra- and intra-cavity spectroscopy to subharmonic OPO pumping. For environmentally-protected delivery we suggest and realize duration-preserving soliton delivery in a ZBLAN fiber. Further bandwidth increase is demonstrated by 2.0-2.8 μm supercontinuum generation in a chalcogenide fiber.
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Evgeni Sorokin, Evgeni Sorokin, Nikolai Tolstik, Nikolai Tolstik, Irina T. Sorokina, Irina T. Sorokina, "1 Watt femtosecond mid-IR Cr:ZnS laser", Proc. SPIE 8599, Solid State Lasers XXII: Technology and Devices, 859916 (6 March 2013); doi: 10.1117/12.2003877; https://doi.org/10.1117/12.2003877

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