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Abstract
We demonstrate that 3-mm-thick, periodically poled ${{\rm LiNbO}_3}$ enables energy scaling of a nonresonant optical parametric oscillator operated in the narrowband mode with a volume Bragg grating at the signal wavelength. Utilizing the full available pump power at 1064 nm, we obtained maximum average powers of 2.25 and 2.08 W for the signal (1.922 µm) and idler (2.383 µm) pulses at 10 kHz, at a total conversion efficiency of 32.8%, which represents a fourfold increase in terms of peak powers over our previous work. The signal and idler spectral linewidths were ${\sim}{1}\;{\rm nm}$, with pulse lengths of ${\sim}{6}\;{\rm ns}$ and an idler beam propagation factor of ${\sim}{5}$.
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