Abstract
We report Kerr-lens mode-locked polycrystalline 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 () at 100 MHz repetition rate with 0.44 W average power. The emission spectrum is 240 nm broad at level and spans 950 nm at 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 and lasers.
© 2015 Optical Society of America
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