Abstract

The orthorhombic biaxial crystal BaGa4S7 has been employed in a 1064 nm pumped optical parametric oscillator generating <6ns long idler pulses with energies as high as 0.5 mJ at 6.217 μm and average power of 50mW at 100 Hz. Notwithstanding the relatively low nonlinearity, 3 times above threshold operation has been achieved at pump intensities more than 5 times below the crystal surface damage limit.

© 2012 Optical Society of America

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