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多热焦距激光谐振腔与单热焦距谐振腔相比,具有结构灵活、热管理简便等优点,然而其热稳定性受到激光头分布等因素影响,需要优化设计以实现多热焦距激光谐振腔高功率稳定输出。理论分析了激光头分布对多热焦距激光谐振腔热稳定性的影响,对比了单热焦距双棒谐振腔、双热焦距3棒对称谐振腔和双热焦距3棒非对称谐振腔的热稳定性。根据理论分析,采用不同热焦距的激光头构成双热焦距3棒串接对称热近非稳腔,通过优化设计,当抽运功率为3480 W时,该连续波1064 nm Nd∶YAG激光系统获得稳定输出,最高输出功率达1125 W,光-光转换效率达32%,光束质量约15 mm.mrad。
Compared with the single focal length resonator, the multi-thermal focal length laser resonator has the advantages of flexible structure and simple thermal management. However, its thermal stability is affected by the laser head distribution and other factors. It is necessary to optimize the design to achieve high thermal focal length laser cavity height Power stable output. The influence of laser head distribution on the thermal stability of multi-thermal focal length laser cavity is theoretically analyzed. The thermal stability of single-focal length double-rod resonator, double-thermal focal length 3-rod symmetric resonator and double thermal focal length 3-rod asymmetric resonator are compared Sex. According to the theoretical analysis, the laser head with different thermal focal length is used to form a 3-rod tandem symmetrical thermal near-unstable cavity with double thermal focal length. By optimizing the design, when the pumping power is 3480 W, the CW 1064 nm Nd: YAG laser system is obtained Stable output, maximum output power of 1125 W, optical-optical conversion efficiency of 32%, the beam quality of about 15 mm.mrad.