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为获得稳定输出的全固态蓝光激光器,在考虑了准三能级Nd:YAG晶体的自吸收损耗、热致透镜效应的基础上,设计了4镜环形谐振腔,采用激光二极管(LD)端面抽运复合Nd:YAG激光晶体,在腔内插入布儒斯特片作为起偏器,由λ/2波片和TGG晶体组成单向器,通过周期极化KTP(PPKTP)内腔倍频,实现了连续单频运转的473 nm蓝光激光器。当激光二极管的抽运功率为20 W时,最大连续单频473 nm蓝光输出功率为770 mW,长期功率稳定性优于±2.2%。利用电子伺服系统将激光器的频率锁定在共焦法-珀(F-P)腔的共振透射峰上,蓝光激光的频率稳定性优于±5 MHz/min。
In order to obtain a stable output all-solid-state blue laser, a 4-mirror ring resonator is designed based on the self-absorption loss and thermal lensing effect of the quasi-three-level Nd: YAG crystal. Laser diode (LD) The composite Nd: YAG laser crystal is inserted into the cavity with the Brewster’s patch as a polarizer. The unidirectional device consists of a λ / 2 wave plate and a TGG crystal, and is cyclically polarized by a KTP (PPKTP) lumen multiplier A continuous single-frequency operation of the 473 nm blue laser. When the laser diode pumping power is 20 W, the maximum continuous single-frequency 473 nm blue output power of 770 mW, long-term power stability better than ± 2.2%. Using an electronic servo system to lock the laser’s frequency to the resonant transmission peak of a confocal-P cavity, the frequency stability of the blue laser is better than ± 5 MHz / min.