We demonstrate the third harmonic generation of a 1542-nm laser using a dual-pitch periodically poled lithium niobate waveguide with a conversion efficiency of 66%/W2. The generated 514-nm light is used for saturation spectroscopy of molecular iodine and laser frequency stabilization. The achieved laser frequency stability is 1.1×10-12 at an average time of 1 s, which is approximately one order of magnitude better than the acetylene-stabilized laser at 1542 nm. Uncertainty evaluation and absolute frequency measurement are also performed. The developed frequency-stabilized laser can be used as a reliable frequency reference at the telecom wavelength for various applications including optical frequency combs and precision interferometric measurement.

中文翻译：

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使用双节距周期性极化铌酸锂波导在电信波长下稳定碘的激光器。

我们演示了使用双节距周期性极化铌酸锂波导的1542 nm激光器的三次谐波产生，其转换效率为66％/ W2。产生的514 nm光用于分子碘的饱和光谱和激光频率稳定化。在1 s的平均时间上实现的激光频率稳定性为1.1×10-12，这比1542 nm处的乙炔稳定的激光大约好一个数量级。还执行不确定度评估和绝对频率测量。所开发的稳频激光器可用作电信波长的可靠频率参考，可用于各种应用，包括光学频率梳和精密干涉测量。