基于角度切割MgO:PPLN晶体的高平均功率、稳定的连续波单振荡光学参量振荡器

报道了一台稳定的、高平均功率连续波光学参量振荡器,该振荡器为单谐振环形腔结构,参量晶体为角度切割的掺氧化镁周期性极化铌酸锂(MgO:PPLN),由一台波长为1064 nm的Nd:YVO4固态激光器泵浦。在9.8 W的泵浦功率下,可得到波长3069.1 nm的闲频光功率2.15 W,其泵浦-闲频光转换效率达21.0%。得益于腔内寄生振荡的减弱以及热自稳效应,振荡器的输出功率在30分钟内的稳定性优于0.19%均方根偏差(rms)。     

Tunable,continuous-wave single-resonant optical parametric oscillator with output coupling for resonant wave

We present a continuous-wave singly-resonant optical parametric oscillator with 1.5% output coupling of the resonant signal wave, based on an angle-polished Mg O-doped periodically poled lithium niobate(Mg O:PPLN), pumped by a commercial Nd:YVO4laser at 1064 nm. The output-coupled optical parametric oscillator delivers a maximum total output power of 4.19 W with 42.8% extraction efficiency, across a tuning range of 1717 nm in the near- and mid-infrared region.This indicates improvements of 1.87 W in output power, 19.1% in extraction efficiency and 213 nm in tuning range extension in comparison with the optical parametric oscillator with no output coupling, while at the expense of increasing the oscillation threshold by a factor of ～ 2. Moreover, it is confirmed that the finite output coupling also contributes to the reduction of the thermal effects in crystal.