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研究了平均功率超过30W的稳定高效全固态绿光激光器,分析得出影响全固态腔内倍频激光器倍频效率和输出稳定性的主要因素是倍频晶体局部温升造成的相位失配和热透镜效应,采用温度梯度补偿控温法对大尺寸倍频晶体进行温度控制,降低激光器工作中倍频晶体内外温度梯度从而有效地克服因晶体局部温升造成的倍频相位匹配角失配和热透镜效应。采用三条60W的半导体激光二极管阵列板条侧面抽运Nd:YAG激光增益介质棒,采用声光调Q,平凹直腔和腔内倍频结构配合温度梯度补偿控温法对大尺寸倍频晶体进行温度控制,得到了稳定高效的532nm绿光输出。在抽运电流25A,抽运功率174.6W时,得到了脉冲宽度110ns,重复频率10kHz,输出平均功率31.6W稳定高效的绿光输出,光-光转换效率为18.1%,功率稳定性为±0.66%,绿光输出光束质量因子M2=4.3。
The stable and efficient all-solid-state green laser with average power more than 30W has been studied. The main factors influencing the frequency-doubling efficiency and output stability of all-solid-state intracavity frequency doublet laser are the phase mismatch and heat Lens effect, using temperature gradient compensation temperature control method for temperature control of large-size double-frequency crystal to reduce the temperature gradient inside and outside the doublet crystal during laser work so as to effectively overcome the frequency doubling phase matching angle mismatch and heat caused by the local temperature rise of the crystal Lens effect. Nd: YAG laser gain medium rod was pumped by three 60W semiconductor laser diode array slabs on the side, and acousto-optic Q-switched, plano-concave cavity and intracavity frequency doubling structure combined with temperature gradient compensation and temperature control method were used to measure large- Temperature control, a stable and efficient 532nm green output. When the pumping current is 25A and the pumping power is 174.6W, a stable and efficient green output with a pulse width of 110ns, a repetition frequency of 10kHz and an average output power of 31.6W is obtained. The light-to-light conversion efficiency is 18.1% and the power stability is ± 0.66 %, Green output beam quality factor M2 = 4.3.