Suntsov Sergiy, Rüter Christian E, Brüske Dominik, Kip Detlef
Opt Express. 2021 Apr 12;29(8):11386-11393. doi: 10.1364/OE.416723.
We report on fabrication of ridge waveguides formed in congruent periodically poled lithium niobate substrates using annealed and reverse proton exchange followed by diamond blade dicing. 1 W of second-harmonic generation at 775 nm has been obtained in a single-pass in 50 mm long ridge waveguides with internal conversion efficiency of 70%. At this power level, 97% pump depletion has been reached. Although elevated temperature operation and ridge geometry help to mitigate photorefractive damage (PRD) effects, nevertheless, at even higher second harmonic outputs significant power drop with blue shift and distortion of the SHG tuning curve have been observed indicating an onset of PRD.
我们报道了在同成分周期性极化铌酸锂衬底上通过退火和反向质子交换，随后进行金刚石刀片切割来制备脊形波导的方法。在50毫米长的脊形波导中单次通过时获得了1瓦775纳米的二次谐波产生，内部转换效率为70%。在这个功率水平下，达到了97%的泵浦耗尽。尽管升高温度操作和脊形几何结构有助于减轻光折变损伤（PRD）效应，然而，在更高的二次谐波输出时，已观察到显著的功率下降以及蓝移和二次谐波产生（SHG）调谐曲线的畸变，这表明PRD开始出现。
