光学学报, 2004, 24 (7): 925, 网络出版: 2010-05-25
104 W内腔倍频全固态Nd∶YAG绿光激光器
104 W Laser Diode-Pumped Intracavity Frequency-Doubled Nd∶YAG Green Light Laser
激光器 Nd∶YAG激光器 532 nm绿光 KTP晶体 内腔倍频 低温冷却 lasers Nd∶YAG laser green beam at 532 nm KTP crystal intracavity frequency doubling strong cooling
摘要
报道了一台高功率内腔倍频全固态Nd∶YAG绿光激光器,针对KTP晶体热效应和激光热稳定腔,采取了对KTP晶体进行低温冷却的优化措施,以便减少KTP晶体的热效应导致的相位失配,同时兼顾了Nd∶YAG棒的热致双折射效应和KTP晶体热透镜效应,设计了热稳定谐振腔;实验中采用80个20 W激光二极管阵列侧面抽运Nd∶YAG棒和Ⅱ类相位匹配KTP晶体(在27 ℃时相位匹配角为=23.6°;θ=90°,尺寸为7 mm×7 mm×10 mm)内腔倍频技术,谐振腔腔长为530 mm,KTP晶体的冷却温度为4.3 ℃,抽运电流为18.3 A时,实现平均功率达104 W、脉冲宽度为130 ns的532 nm激光输出;其重复频率为20.7 kHz。光光转换效率为10.2%。
Abstract
An average 104 W green beam operation by intracavity frequency doubling of Nd:YAG laser, which is pumped by eighty 20 W high-power laser diodes is reported. A type Ⅱ phase matched KTP crystal (=23.6°,θ=90° under the condition of 27 ℃,its size is 7 mm×7 mm×10 mm) is applied for frequency doubling of Nd∶YAG laser. The length of resonator is 530 mm. The KTP crystal is placed in the special cooling device. Under the pumping current of 18.3 A, KTP crystal is cooled to 4.5 ℃. A maximum green power of 104 W was generated at 20.7 kHz repetition rate and 132 ns pulse width when pumping current of laser diodes is 18.3 A, leading to 10.2% of optical-optical conversion efficiency.
徐德刚, 姚建铨, 郭丽, 周睿, 张百钢, 丁欣, 温午麒, 王鹏. 104 W内腔倍频全固态Nd∶YAG绿光激光器[J]. 光学学报, 2004, 24(7): 925. Xu Degang, Yao Jianquan, Guo Li, Zhou Rui, Zhang Baigang, Ding Xin, Wen Wuqi, Wang Peng. 104 W Laser Diode-Pumped Intracavity Frequency-Doubled Nd∶YAG Green Light Laser[J]. Acta Optica Sinica, 2004, 24(7): 925.