Singly resonant, all-solid-state, mode-locked LiB3O5 optical parametric oscillator tunable from 652 nm to 2.65 µm

A singly resonant mode-locked optical parametric oscillator is described that is based on temperature-tuned LiB3O5 and synchronously pumped by a frequency-doubled, mode-locked, Q-switched, diode-laser-pumped Nd:YLF laser at 523.5 nm. The oscillator is broadly tunable throughout the range of 652 nm to 2.65 microns and can simultaneously generate two pairs of signal and idler beams, leading to four-color operation of the device over an extensive wavelength range from about 664 nm to 2.47 microns. Oscillation thresholds of about 2.5 GW/sq cm and internal pump depletions of about 20 percent have been measured.