Abstract
The orthorhombic biaxial crystal has been employed in a 1064 nm pumped optical parametric oscillator generating long idler pulses with energies as high as 0.5 mJ at 6.217 μm and average power of at 100 Hz. Notwithstanding the relatively low nonlinearity, 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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