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 ≈100-fs mid-IR pulses with 1 2-µJ energy. Exceptionally low pulse-energy f luctuations of only 0.2% in the mid-IR (λ ≈ 3-6 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.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics