Talbot外腔压窄线阵大功率半导体激光器输出谱宽

Spectra narrowing of high-power diode laser array based on Talbot external cavity

摘要: 线阵半导体激光器（LDA）内部发光元周期排列，基于Talbot效应，改进传统Littrow外腔窄线宽系统，在Littrow外腔中置入反射率为20%平平镜构成Talbot外腔以进一步窄化激光器输出谱宽，并将外腔窄线宽输出通过铷池进行吸收实验。实验结果表明：铷池对Tablot外腔输出吸收系数比Littrow外腔吸收系数相对提高42.9%，说明Talbot外腔能有效提高外腔输出谱宽的均匀性，提高半导体激光器泵浦效率。

Abstract: Many light emitting elements were periodically arranged in a high power diode laser array. Based on Talbot effect, the traditional Littrow external cavity narrow-linewidth system was improved. A Talbot external cavity was established by inserting a flat mirror with a reflection rate of 20% in the Littrow external cavity. The relative absorption coefficient was improved by 42.9% in rubidium pool absorption experiment, showing that the Talbot external cavity can improve output beam uniformity and pumping efficiency of the diode laser array.