Energy scaling of a narrowband, periodically poled LiNbO3, nanosecond, nonresonant optical parametric oscillator

We demonstrate that 3-mm-thick, periodically poled LiNbO3 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 mu m) and idler (2.383 mu m) 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 similar to 1 nm, with pulse lengths of similar to 6 ns and an idler beam propagationfactor of similar to 5. (c) 2024 Optica Publishing Group