In order to study the optical feedback characteristics at the dual frequency laser, a birefringent external cavity was studied throughboth theoretical analysis and experiments. 摘要为了研究双频激光器的光回馈特性，采用双折射外腔光回馈的方法，进行了理论分析和实验验证，取得了双频激光器中条纹倍频现象的数据。
Methods and mechanism of obtaining single-frequency in all-solid-state intracavity frequency doubling lasers by single-longitudinal-mode ways are described in this paper. 本文详细分析了用单纵模法实现全固态腔内倍频激光器单频输出的各种方法和实验装置。
