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激光二极管泵浦的固体激光器因其光谱重叠度高、结构紧凑 ,一直吸引着人们的广泛关注。尤其是进入二十世纪八十年代以来 ,由于量子阱结构的提出及晶体生长工艺的发展 ,高效率、高功率激光二极管及其阵列取得了很大成就 ,推动LD泵浦的固体激光器进入突飞猛进的发展阶段 ,并达到了实用水平。单频稳频内腔倍频激光器是非线性光学及量子光学的重要光源 ,本文报道LD泵浦的四镜八字环行腔Nd :YVO4 /KTP内腔倍频稳频激光器。激光腔结构设计考虑泵浦光的光束质量因子 ,热不灵敏条件[6] ,消除空间烧孔效应 ,实现单频运转。腔内插入λ/ 2波片和放在磁场中的TGG晶体 (使激光偏振方向转动 7°)构成单向器 ,使激光器单向运转。泵浦功率为 11W时 ,获得 1.3W单频绿光 ,光 -光转换效率 11.8% ,在自由运转情况下频率稳定性优于 2MHz ,通过边带稳频反馈系统将输出激光频率锁定在F -P共焦参考腔的中心频率上 ,频率稳定性优于 4 0 0kHz。
Laser diode-pumped solid-state lasers have attracted people’s attention due to their high spectral overlap and compact structure. Especially since the 1980s, due to the proposed quantum well structure and the crystal growth process, great achievements have been made in high efficiency, high power laser diodes and their arrays, driving LD-pumped solid-state lasers into a rapid development Development stage, and reached a practical level. The single-frequency frequency-stabilized lumen frequency doubling laser is an important source of nonlinear optics and quantum optics. This paper reports the LD pumped quadrupole toroidal Nd: YVO4 / KTP lumen frequency stabilized laser. Laser cavity structure design considers the beam quality factor of the pump light, heat insensitive conditions [6], eliminate the hole burning effect, to achieve single-frequency operation. Insert the λ / 2 wave plate and the TGG crystal placed in the magnetic field (turning the laser polarization direction by 7 °) into the unidirectional device to make the laser operate in one direction. When the pump power is 11W, the single frequency green light of 1.3W is obtained, the light - light conversion efficiency is 11.8%, the frequency stability is better than 2MHz in the free running condition, and the output laser frequency is locked in the F - P confocal reference cavity center frequency, the frequency stability is better than 400kHz.