Abstract: We report wavelength tunable quasi-phase-matching (QPM)optical parametric oscillators (OPOs) based on periodically poled lithium niobate (PPLN) pumped by an acousto-optically Q-switched CW-diode-end-pumped Nd:YVO4 laser. Widely wavelength tunable outputs have been obtained by using temperature tuning, angle tuning and grating period tuning. The analysis of comparison about these tuning methods is given in this paper which is helpful to realize widely, rapidly and continuously tunable coherent sources.

Key words: We report wavelength tunable quasi-phase-matching (QPM)optical parametric oscillators (OPOs) based on periodically poled lithium niobate (PPLN) pumped by an acousto-optically Q-switched CW-diode-end-pumped Nd:YVO4 laser. Widely wavelength tunable outputs have been obtained by using temperature tuning, angle tuning and grating period tuning. The analysis of comparison about these tuning methods is given in this paper which is helpful to realize widely, rapidly and continuously tunable coherent sources.