Abstract
A BaGa4Se7 nanosecond optical parametric oscillator (OPO) shows extremely wide idler tunability in the mid-IR (2.7-17μm) under 1.064μm pumping. The ∼10 ns pulses at ∼7.2 μm have an energy of 3.7mJ at 10Hz. 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%.
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