基于紧凑型Nd∶YAG/PPMgLN模组的561 nm基模激光器

A 561 nm Fundamental Mode Laser Based on a Compact Nd∶YAG/PPMgLN Module

本文提出了一种非线性晶体的切角方法,通过切去谐振腔中掺氧化镁周期极化铌酸锂(PPMgLN)晶体输出端面的一角,改变输出端面的激光模式分布,从而实现了稳定的561 nm黄光激光的基模输出。利用有限差分本征模法,仿真出各种切角方案输出端面的激光模式分布,讨论其输出基模的原理,并通过实验测出各方案输出功率随泵浦功率的变化曲线。结果表明,当抽运功率为4.8 W时,实现了最高121 mW的基模输出,光-光转换效率为2.6%,中心波长为560.95 nm,半峰全宽为0.92 nm,3 h内波动性小于1.91%。与已报道的实验结果对比,该实验结果具有更小的结构尺寸,为紧凑型基模激光器提供重要参考。

In this paper,a nonlinear crystal corner-cutting method is proposed to change the laser mode distribution on the output face of the PPMgLN crystal by cutting off a corner of the output face of the PPMgLN crystal in the resonance cavity,so as to realize the stable fundamental mode output of the 561 nm yellow laser.Using the finite-difference eigenmode method,the laser mode distributions at the output end face of various corner-cutting schemes were simulated to discuss the principle of their output fundamental mode,and the change curves of the output power of each scheme with the pump power were measured experimentally.The results show that when the pumping power is 4.8 W,the highest fundamental mode output of 121 mW is realized,with an optical-to-optical conversion efficiency of 2.6%,a central wavelength of 560.95 nm and a full width at half maximum of 0.92 nm,and an instability of less than 1.91%in 3 h.With a smaller structure size compared with the reported experimental results,this experimental result will provide an important reference for compact fundamental mode lasers.