Femtosecond mid-IR difference-frequency generation in LiInSe2

We employ LiInSe2 nonlinear crystal for difference-frequency generation between signal and idler of a synchronously pumped femtosecond optical parametric oscillator at 80 MHz achieving continuous tuning from 4 mu m (16.7 mW) to 11.5 mu m (2.3 mW). (C) 2013 Optical Society of America