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An efficient single resonant extracavity optical parametric oscillator is demonstrated based on a Type II noncritical phase matching KTA crystal.Under a pump power of 0.6 W and a pulse width of 13 ns, the average power of 86 mW at 3.467 μm is obtained with the pulse width of 6 ns and repetition rate of 100 Hz, corresponding to a conversion efficiency as high as 14% from 1.064 to 3.467 μm. The beam...
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