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报道了一台输出功率达50 W量级的采用808 nm高功率激光二极管双端抽运的Nd∶YVO4复合晶体基模固体激光振荡器。双端抽运结构和复合晶体的采用有效地降低了激光晶体中的热效应,可在晶体中获得更加均匀的热分布和增益分布。使用非对称平平腔动态稳定腔结构,使激光器的两个稳定区分离,并使其运行在稳定区I中,这样不仅可以进行高功率抽运,而且可以获得很低的失调灵敏度。对谐振腔腔长进行优化后,在抽运功率约104 W时获得了最高51.2 W的基模连续激光输出,基模光光转换效率达49.2%;通过在腔内插入声光调Q器件,获得了重复频率在50~600 kHz之间连续可调的脉冲激光输出。重复频率在100~600 kHz之间时,平均输出功率可基本稳定在49 W,脉冲宽度从18.2 ns增加到85 ns;重复频率50 kHz时,平均输出功率43.2 W,脉冲宽度13.5 ns,峰值功率为64 kW。
Reported a Nd: YVO 4 composite crystal-based solid-state laser oscillator with 80-nm high-power laser diode double-ended pumping output of 50 W. The use of a double-ended pumping structure and a composite crystal effectively reduces the thermal effects in the laser crystal, resulting in a more uniform distribution of heat and gain in the crystal. The use of an asymmetric flat cavity dynamic stabilization cavity structure separates the two stable regions of the laser and allows it to operate in stable region I, allowing not only high power pumping, but also very low offset sensitivity. After optimization of cavity length, the maximum continuous-mode laser output of 51.2 W was obtained at pump power of about 104 W, and the conversion efficiency of the fundamental mode light reached 49.2%. By inserting the acousto-optic Q-switching device into the cavity, Pulsed laser output with continuously adjustable repetition rate between 50 and 600 kHz was obtained. When the repetition frequency is between 100 and 600 kHz, the average output power can be basically stabilized at 49 W and the pulse width increases from 18.2 ns to 85 ns. The average output power is 43.2 W and the pulse width is 13.5 ns at a repetition frequency of 50 kHz. The peak power It is 64 kW.