83W 659.5nm全固态红光激光器

All-Solid-State Red Laser with 83 W Output Power at 659.5 nm

报道了采用双抽运头串联的对称直通腔结构及KTP晶体腔内倍频实现高功率红光激光输出的实验结果.在激光二极管(LD)抽运功率为1250 W,声光Q开关工作重复频率为10 kHz条件下,获得平均功率为83 W,波长为659.5 nm的红光激光输出,光-光转换效率为6.7%,斜率效率为17%.激光器采用平-平腔结构,每个抽运头使用了一个连续运转的高功率激光二极管侧面抽运组件,组件内由35只20 W的激光二极管呈五边形阵列分布抽运一根Nd∶YAG圆棒.采用镜片镀膜的方法使Nd∶YAG工作在1319 nm波长,经腔内倍频得到单一波长659.5 nm红光输出,并对该激光器的基频及倍频输出特性进行了实验研究.

The experimental results of high-power red laser constituted of a symmetrical linear resonator with two pumping modules, and intracavity frequency-doubling with a KTP crystal are reported. The average output power of 83 W at 659.5 nm was obtained in the condition of 1250 W pump power and the acoustic-optical Q-switching repetition rate of 10 kHz. The optical-optical efficiency was 6.5 % and the optical slope efficiency was 17%. The laser adopted a plane-plane cavity structure. Every pumping head was equipped with a high power continuous wave （CW） side-pump module comprising of a Nd： YAG rod side-pumped by thirty-five 20 W laser diode arrays （LSAs） with pentagon geometry. To realize the oscillation of single wavelength of 1319 nm in Nd： YAG, the reflectivities of the resonator mirror are designed, which also leads to the single wavelength output of second-order harmonic （659.5 nm）. The laser output characteristics of fundamental and frequency-doubled wavelengths have been studied.