高温激光二极管抽运全固态激光器

High Temperature Laser Diode Pumped All-Solid-State Laser

为实现激光二极管抽运全固态激光器(DPSSL)的小型轻量化和高效率,研究了采用高温激光二极管(LD,808nm,55℃)作为抽运源,降低温控系统制冷压力,减小传导冷却结构体积、重量、功耗的思路和方法。分析了激光二极管抽运全固态激光器中热电制冷器制冷量与激光二极管工作温度的关系,采用高温激光二极管阵列抽运源和角锥棱镜谐振腔设计了可靠性高、小型轻量化的全固态激光器,研制了工程化样机,激光器重复频率为50Hz,连续工作时间达6min,脉冲能量为85.7mJ,脉冲宽度为10.8ns,光束发散角为2.8mrad,电光效率为4.3%,体积为170mm×62mm×80mm,重量为1.1kg。研究表明,高温激光二极管抽运的全固态激光器是实现DPSSL小型轻量化和高效率的有效途径。

For miniaturization, light weight and high efficiency of the diode pumped all-solid-state laser （DPSSL）, a new method is studied with laser diodes （LD） operating at high temperature （808 nm, 55 ℃） as the pumping source. The refrigeration press of the temperature control system is reduced, and the bulk, weight and power of the conductive cooling structure are optimized. The relationship between the cooling power of thermoelectric cooler used in DPSSL and the operation temperature of LD is studied. A highly reliable, miniaturized light-weight DPSSL is designed by using the pump source of high temperature LD array and the corner cube prism resonator. An engineering laser prototype is developed with parameters as follows： repetition rate 50 Hz, continuous operation time 6 min, pulse energy 85.7 mJ, pulse width 10.8 ns, divergence angle 2.8 mrad, electro-optic efficiency 4.3%, volume 170 mm× 62 mm×80 mm, and weight 1.1 kg. The results show that the high temperature LD pumped all solid-state laser is an effective way to realize small, light-weight highly effective DPSSL.