频率稳定的非平面环形腔激光器

Frequency Stabilization Laser Based on Non-Planar Ring Oscillator

研究了激光二极管端面抽运非平面环形腔(NPRO)激光器,获得了1.254W的1064nm单频可调谐激光输出,斜率效率为51.5%,在1h测试时间内的功率稳定度为±0.8%。对输出激光的光束质量进行了测量,两方向的光束质量因子分别为M2x=1.16和M2y=1.05,采用拍频法测量表明激光线宽小于2kHz。通过对激光晶体的温度控制实现了18GHz的频率变化,在无跳模情况下,连续调谐系数约为-2.9GHz/℃。通过光纤延迟自拍法对激光频率的短期稳定度进行了测试,获得激光器在100ms积分时间内的频率稳定度为4.7×10-12。

A tunable single frequency non-planar ring oscillator laser is studied. The output power of the 1064 nm single frequency laser is 1. 254 W and the slope efficiency is 51.5 %. The power stability is ± 0.8 % within 1 h. The beam qualities of two orientations are measured, which shows the beam quality factors are Mx2 = 1.16 and My2 1.05, respectively. The laser linewidth is less than 2 kHz measured by beat frequency measurement method. Besides, the frequency tuning of the single frequency laser is also studied by adjusting the temperature of the crystal. The maximum tuning range is about 18 GHz with a tuning coefficient of --2.9 GHz/℃. Meanwhile, the short-term frequency stability is obtained by self-beat-frequency method. The results show that the short-term frequency stability is 4.7 ×10^-12 within 100 ms integral time.