窄脉宽LD泵浦全固态绿光激光器的实验研究

研究了绿光平均功率达84W的高稳定声光调Q全固态激光器。通过理论分析和试验研究,针对KTP热效应以及Nd∶YAG棒的热致双折射效应,设计并优化了谐振腔来压窄脉宽。采用35个20W的高功率LD侧面抽运Nd∶YAG棒和Ⅱ类相位匹配KTP晶体(24℃时相位匹配角为Φ=23.6°,θ=90°,尺寸为7mm×7mm×7mm),采用双声光Q开关,高效平凹结构,实现了高功率内腔倍频激光器的稳定运转;在抽运电流25A时,获得了重复频率为10kHz,脉冲宽度优于45ns,输出功率为84W的高功率、高重频、窄脉宽绿光(532nm)输出,光_光转换效率为14.3%,不稳定度为±3%。

Study on the narrow pulse-width diode-pumped solid-state green laser operation

A high stable 84W acousto-optic Q-switch solid-state green laser,which is pumped by thirty 20W high power laser diodes was reported. Through theoretical analysis and experimental research,the resonator was designed and optimized in order to compress pulse-width. In experiment,the double acousto-optic Q-switch was employed with single Nd∶YAG rod and a type Ⅱ phase matched KTP crystal(Φ= 23.6°,θ= 90°under the condition of 24℃ ,its size is 7 mm × 7mm × 7mm) was applied for frequency doubling. The resonator is the flat-concave type. Under the pumping current of 25A,a maximum green power of 84W was generated at 10kHz repetition rate and 45 ns pulse-width,leading to 14.3 % of optical-optical conversion efficiency and ± 3 % instability.