"20 to 50 fs pulses tunable across the NIR from a blue pumped noncollinear parametric amplifier"J. Piel, M. Beutter, E. Riedle
Opt. Lett. 25, 180 - 182 (2000)
A two-stage blue-pumped noncollinearly phase matched optical parametric amplifier (NOPA) was used to generate NIRpulses continuously tunable between 865 and 1600 nm. The pulse lengths scaled from 20 fs at the shorter wavelengthsto below 50 fs at 1600 nm with a nearly Fourier-transform limited bandwidth. From 200 µJ of 775 nm pump light at 1 kHzrepetition rate and 130 fs duration between 7 and 2.5 µJ pulse energies were generated corresponding to a typicalquantum efficiency of 25 % from blue to NIR light.
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