为了研制光参量振荡器的单频制抽运源,采用偏压反馈的扫描-触发谐振探测技术,设计了种子注入的脉冲重复频率为500Hz的单端抽运键合Nd∶YAG的电光调Q单频脉冲激光器,建立了单纵模振荡并进行了理论分析。结果表明,在抽运能量为36.8mJ时,输出单脉冲能量为8.4mJ,光光建模效率为23%,脉冲宽度为6.8ns,光束质量因子M2≈1.3,脉冲峰值功率为1.2MW;利用F-P标准具获得输出激光的干涉图样,经过1h观察,该激光器输出单纵模概率为100%。这一结果对于抽运光参量振荡器的研制是有帮助的。

In order to develop a single-frequency pumping source for an optical parametric oscillator, a seed-injected, single-end pumped, Q-switched, bonded Nd∶YAG single-frequency laser with 500Hz pulse repetition rate was designed by using the ramp-fire resonance detection technique with bias feedback, and a single longitudinal mode oscillation was established. The technology was analyzed theoretically. The results show that, when pump energy is 36.8mJ, output single pulse energy is 8.4mJ and optical efficiency is 23%, pulse width is 6.8ns, beam quality factor M2 is about 1.3, and peak power is 1.2MW. The interference pattern of output laser is obtained by using a F-P etalon. After one hour observation, single longitudinal mode probability of laser output is 100%. The result is helpful for the pump design of optical parametric oscillators.