Temperature, angle, and grating period simultaneously tuned QPM optical parametric oscillator based on PPLN

We report a temperature, angle and grating period simultaneously tuned all-solid-state optical parametric oscillator with periodically poled lithium niobate (PPLN) pumped by a 1064nm acousto-optically Q-switched cw-diode-end-pumped Nd: YVO4 laser. Continuously tunable signal output from 1441.2nm to 1532.6nm is obtained by changing the temperature, the angle and the position of the multi-grating PPLN crystal. The PPLN crystal contained three gratings, equally spaced in period from 28 to 29μm (at room-temperature).