Optical parametric generation in CdSiP2 at 6.125 µm pumped by 8 ns long pulses at 1064 nm.

A 21.4 mm long noncritically cut CdSiP2 crystal, pumped by 8 ns pulses at 1064 nm in a double-pass configuration for pump, signal, and idler, generated 523 µJ, 5.8 ns idler pulses at 6.125 µm. The average power of 52.3 mW at the repetition rate of 100 Hz is the highest ever achieved at such wavelengths with direct down conversion from the 1 µm spectral range.