Synchronously pumped at 1064 nm OPO based on CdSiP2 for generation of high power picosecond pulses in the mid-infrared near 6.4 μm

The recently developed chalcopyrite CdSiP2 is employed in a picosecond, 90 degrees-phase-matched synchronously pumped optical parametric oscillator pumped at 1064 nm, to produce quasi-steady-state idler pulses near 6.4 mu m with an energy as high as 2.8 mu J at 100 MHz. The train of 2 mu s long macropulses, each consisting of 200 (picosecond) pulses, follows at a repetition rate of 25 Hz. This corresponds to an average power of 14 mW. The pump depletion (conversion efficiency) exceeds 40%. Without intracavity etalon, the 12.6 ps long mid-IR micropulses have a spectral width of 240 GHz.