基于光纤激光倍频的高功率绿光光源研究进展  

Recent progress of high power green laser based on frequencydoubling technology for fiber laser

作　　者：马天 李富全[1] 林宏奂[1] Ma Tian;Li Fuquan;Lin Honghuan(Laser Fusion Research Center,CAEP,P.O.Box 919-988,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2023年第7期40-47,共8页High Power Laser and Particle Beams

摘　　要：详细调研了近年来基于光纤激光倍频的高功率绿光光源的研究进展,绿光激光功率从百瓦到千瓦,光束质量近衍射极限,而且输出功率有望进一步提升。采用光纤激光倍频技术得到高功率绿光光源的技术路线大致分为两条:一条是用高功率单子束光纤激光器作为基频光源,然后级联单程非临界相位匹配LBO晶体作为倍频;另一条是用多子束光纤激光器作为基频光源,然后合成与倍频分别实现,或者合成与倍频一体实现。对比两条技术路线,前者相对后者简单,后者具有更高输出功率的潜力,但是倍频晶体的弱吸收是两条技术路线共同面临的问题。The green laser can be used for the processing of highly reflective metals such as copper.Comparedwith the 1μm laser which is broadly used now,green laser has the absorption efficiency nearly an order of magnitudehigher,which can better meet the needs of various fields for the precision processing of highly reflective metals.Thus,the application prospect of high power green laser is very broad.In this paper,recent progress of high power greenlaser based on frequency doubling technology for fiber laser is investigated in detail.The power of green laser hasincreased from 100 W to 1 kW,the beam quality is close to the diffraction limit,and the output power is expected tobe further improved.There are two technical routes to obtain high power green laser by using fiber laser frequencydoubling technology.One is to use high power single beam fiber laser as the fundamental frequency light source andcascade single-pass frequency doubling technology.The other is to use multiple-beam fiber lasers as the fundamentalfrequency light source,realize beam combining and frequency doubling respectively,or beam combining andfrequency doubling at the same time.The former route is simpler than the latter,but the latter has the potential ofhigher output power.The weak absorption of frequency doubling crystal is the common problem faced by the twotechnical routes.

关 键 词：激光光学 高功率光纤激光 倍频技术 绿光激光 相位匹配 

分 类 号：O439[机械工程—光学工程]