全固态LBO腔内倍频556nm黄光激光器

All-Solid-State 556-nm Yellow Laser by LBO Intracavity-Frequency-Doubling

全固态黄光激光器大多采用掺Nd3+激光晶体的4F3/2-4I11/2和4F3/2-4I13/2能级跃迁和腔内和频技术来获得,由于在输出光斑质量和功率稳定性方面一直存在较多困难,所以寻找合适的基频光谱线同时利用腔内倍频是一种切实可行的解决方案。通过对Nd∶YAG激光谱线分析以后发现4F3/2-4I11/2这两个能级间部分激光谱线(1112nm,1116nm,1123nm)经过倍频以后正好可以获得黄光激光输出。通过对Nd∶YAG各主要谱线激光参量比较和分析后发现,要想获得增益较低激光谱线1112nm,1116nm,1123nm振荡,可以通过镀制特殊要求的谐振腔膜抑制增益较大的1064nm,1319nm,946nm激光谱线运转来实现。通过对谐振腔膜系的设计以及倍频晶体的合理选择和放置,采用LBO晶体腔内倍频,利用2W的激光二极管(LD)抽运Nd∶YAG,获得了556nm黄光激光输出,在1.6W的抽运功率下,最大输出功率为102mW,光-光转换效率为6.4%。

The generation of yellow laser mostly uses the laser transitions from ^4F3/2 to ^4I13/2 and ^4F3/2 to ^4I13/2 of Nd^3＋ doped crystal and adopts the technology of intracavity-frequency-mixing, but there are many difficulties for obtaining the high quality facula and high stable output power, thus the method of intracavity-frequency doubling is proposed. The 1112-nm, 1116-nm, 1123-nm laser operations which have lower gain are obtained through suppressing the laser operations （at 1064 nm, 1319 nm, 946 nm） which have higher gain by film coated design of the cavity. Through the film coated designing and the frequency-doubling crystal selecting and aligning, the 556-nm yellow laser is obtained. The maximum output power is 102 mW, the light to light conversion efficiency is 6.4% when the incident pump power is 1.6 W。