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Broadly tunable femtosecond pulse generation in the near and mid-infrared

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Abstract

High-repetition-rate (80-MHz) femtosecond infrared pulses are generated by difference frequency mixing (DFM) a femtosecond Ti:sapphire laser with a phase-locked synchronized cw mode-locked Nd:YAG picosecond laser. This DFM scheme is of particular interest for generating ultrashort near-IR pulses (∼10 fs) because group velocity mismatch with a pump pulse can be ignored. The simplicity and the broad wavelength tunability (from the near IR to the mid-IR) of this scheme is demonstrated. Short (125-fs FWHM) optical pulses in the near IR around 1.5 µm are obtained with noncritical type-I phase-matched LiB3O5. We also used a similar scheme to generate mid-infrared pulses at 3.0 µm with type-II phase-matched KTiOPO4.

© 1997 Optical Society of America

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