8.1W全固态准连续红光Nd∶YAG激光器

LD Pumped Nd∶YAG/KTP Quasi Continuous Wave Red Light Laser with 8.1 W Output Power

报道了利用Ⅱ类临界相位匹配的KTP晶体(相位匹配角选为θ=599°,=0°)对Nd∶YAG在13μm附近的振荡进行腔内倍频,产生高功率准连续红光激光的实验结果。激光器使用了一个连续运转的高功率激光二极管(LD)侧面抽运组件(组件内由30个20W的二极管阵列呈三角形阵列分布抽运一根Nd∶YAG圆棒),使用声光调Q技术实现高重复频率输出,并选用了平凹直腔的腔体结构。对该激光器的基频(13μm波长)调Q和倍频红光的功率输出特性及光谱特性进行了研究。在LD抽运功率453W时产生了最大输出功率81W的准连续红光激光,测量了此时的M2值并给出了光强分布图。

This paper reports the generation of high power quasi continuous wave (Q CW) red laser radiation by frequency doubling a Nd∶YAG (Nd∶Y 3Al 5O 12 ) laser operating at wavelength near 1 3 μm with a KTP (KTiPO 4) crystal (type Ⅱ phase match, θ=59 9°, =0°). The laser, with plane concave cavity structure, is employing a high power CW pump module comprised a Nd∶YAG rod side pumped by thirty 20 W laser diode arrays (LDAs) of a triangle radial geometry, and an acousto optic Q switch which results in the laser high repeated Q CW output. The laser output characteristics of fundamental and frequency doubled wavelengths involving powers and spectra have been studied. The highest power of the quasi CW red laser is 8 1 W, achieved at 453 W pump power of LD. The value of M 2 and the distribution figure of red beam at 8 1 W output power are given in the paper.