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Three optical cycle mid-IR Kerr-lens mode-locked polycrystalline Cr2+:ZnS laser

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Abstract

We report Kerr-lens mode-locked polycrystalline Cr2+:ZnS lasers at 2.4 μm central wavelength optimized for short pulse duration. By control of the second- and third-order dispersion within 500 nm bandwidth we obtained pulses of three optical cycles (<29fs) at 100 MHz repetition rate with 0.44 W average power. The emission spectrum is 240 nm broad at 3dB level and spans 950 nm at 30dB level. Transform-limited 38 fs pulses were obtained at 300 MHz repetition rate with 700 mW average power. To the best of our knowledge these are the shortest reported to-date pulses from Cr2+:ZnS and Cr2+:ZnSe lasers.

© 2015 Optical Society of America

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