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介绍了激光二极管(LD)侧面抽运Nd∶YAG晶体腔外四倍频获得平均功率为1.85 W的266 nm全固态紫外激光器。采用双棒串接结构,对热致双折射作用引起的退偏效应进行补偿,获得高光束质量、高稳定性的线偏振1064 nm基频光输出。分别采用Ⅰ类非临界相位匹配的三硼酸锂(LBO),Ⅰ类相位匹配的β相偏硼酸钡(BBO)作为腔外倍频和四倍频晶体,获得了平均功率1.85 W,脉冲重复频率10 kHz和转换效率达13.3%的紫外激光输出。同时研究了BBO晶体自热效应对四倍频相位匹配角的影响,提出了可以通过调整BBO晶体的角度来减小自热效应的影响。
A 266 nm all - solid - state UV laser with an average power of 1.85 W is introduced by lateral quadrupole laser pumping of Nd: YAG crystal on the side of a laser diode (LD). The dual-rod cascaded structure is used to compensate the depolarization effect caused by thermal induced birefringence to obtain a linearly polarized 1064 nm fundamental light output with high beam quality and high stability. Class I non-critical phase-matched lithium borate (LBO) and phase Ⅰ phase-matched beta phase barium metaborate (BBO) were used as extraluminal and quadruple-frequency crystals respectively. The average power was 1.85 W and the pulse repetition frequency 10 kHz and conversion efficiency of 13.3% UV laser output. At the same time, the effect of self-heating effect of BBO crystal on quadrupole frequency matching angle was studied, and the effect of self-heating effect could be reduced by adjusting the BBO crystal angle.