Widely tunable in the mid-IR BaGa4Se7 optical parametric oscillator pumped at 1064 nm

A BaGa4Se7 nanosecond optical parametric oscillator (OPO) shows extremely wide idler tunability in the mid-IR (2.7-17 mu m) under 1.064 mu m pumping. The similar to 10 ns pulses at similar to 7.2 mu m have an energy of 3.7 mJ at 10 Hz. The pump-to-idler conversion efficiency for this wavelength reaches 5.9% with a slope of 6.5% corresponding to a quantum conversion efficiency or pump depletion of 40%. (C) 2016 Optical Society of America