论文部分内容阅读
从实验和理论两方面分析了808nm和885nm激光二极管(LD)端面抽运Nd:CNGG 935nm激光器的热透镜效应。当吸收功率为10W时,在885nm LD端面抽运情况下,Nd:CNGG激光器的热透镜焦距约为808nm LD端面抽运方式下的6.8倍。同时,利用885nm LD端面抽运方式,晶体内部的温度梯度更小。利用808nm和885nm LD端面抽运方式,在抽运光束腰位置,Nd:CNGG晶体内部最高温度分别为287.76K和310.05K。在抽运端面位置,晶体最高温度分别为285.78K和317.18K。相对于同等实验条件下的808nm抽运方式,885nm抽运下的Nd:CNGG 935nm激光器斜率效率提高了43%(从4.6%提高到6.6%),阈值降低了8%(从3.31 W下降到3.05W)。
The thermal lens effect of Nd: CNGG 935nm laser at 808nm and 885nm laser diode (LD) end facets is analyzed experimentally and theoretically. When the absorbed power is 10W, the thermal focal length of the Nd: CNGG laser is about 6.8 times higher than that of the 808nm LD end-pumped at 885nm LD end-pumped. At the same time, the use of 885nm LD end-pumped mode, the temperature gradient within the crystal smaller. Using the 808nm and 885nm LD end-pumped modes, the maximum internal temperatures of Nd: CNGG crystals at the position of the pumping beam waist are 287.76K and 310.05K, respectively. In the pumping end position, the maximum temperature of the crystal were 285.78K and 317.18K respectively. The slope of the Nd: CNGG 935 nm laser at 885 nm pumping efficiency was improved by 43% (from 4.6% to 6.6%) and the threshold was reduced by 8% (from 3.31 W to 3.05 at 808 nm pumping mode under the same experimental conditions) W).