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Noise suppression in femtosecond mid-infrared light sources

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Abstract

An experimental and theoretical study of intrinsic correlations and noise-suppression mechanisms in two-stage femtosecond mid-IR light sources is presented. The setup, based on parametric amplification in BBO and subsequent difference-frequency mixing in AgGaS2, delivers 100fs mid-IR pulses with 12µJ energy. Exceptionally low pulse-energy fluctuations of only 0.2% in the mid-IR λ36 µm are found, which are much smaller than the Ti:sapphire amplifer noise. The noise suppression is analyzed and found to stem from the interplay between dispersion and pump depletion.

© 2000 Optical Society of America

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