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根据激光介质的热透镜焦距及其随抽运功率的变化,设计了大模体积高准直稳定性谐振腔以获得较大的模体积,同时使谐振腔对热焦距的变化和机械对准的扰动不灵敏。这种设计可以提高激光器的效率和稳定性,并且使输出激光具有较好的光束质量。采用双声光Q开关提高关断功率,在输出功率1250 W的连续激光二极管阵列抽运下,获得了210 W的调Q激光输出。采用工作温度80℃的Ⅱ类匹配KTP晶体,以避免KTP晶体的灰色轨迹效应,对KTP晶体采用半导体温控系统控温,在重复频率10 kHz时获得了162 W的调Q绿光输出,光-光转换效率达到13%,脉宽约为80 ns,光束质量M2因子约为20。
According to the focal length of the thermal lens of the laser medium and its variation with the pumping power, a large-mode, high-volume, collimated resonator with a high stability is designed to obtain a larger module volume. At the same time, the thermal focal length variation and the mechanical alignment Disturbed insensitive. This design can improve the efficiency and stability of the laser, and the output laser beam has a better quality. A dual-acousto-optic Q-switch was used to increase the turn-off power and a 210 W Q-switched laser output was obtained with a continuous laser diode array pump output of 1250 W. A class Ⅱ matching KTP crystal with 80 ℃ operating temperature was used to avoid the gray trace effect of KTP crystal. The KTP crystal was controlled by a semiconductor temperature control system, and a 162 W Q-switched green output was obtained at a repetition frequency of 10 kHz. The light - Light conversion efficiency of 13%, pulse width of about 80 ns, beam quality M2 factor of about 20.