锁模光纤激光的倍频及波长调谐实验研究  

Experimental study on frequency doubling and wavelength tuning of a mode-locked fiber laser

作　　者：姚向红[1,2] 林一楠[1] 宋红岩 顾春[1] 许立新[1] 

机构地区：[1]中国科学技术大学光学与光学工程系,安徽合肥230026 [2]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《量子电子学报》2016年第2期237-242,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金;U1330104~~

摘　　要：利用周期性极化铌酸锂(PPLN)晶体实现了对掺镱锁模光纤激光器输出单横模激光的倍频,产生了532nm波长附近的倍频脉冲光。基于准相位匹配(QPM)技术,通过改变基频光到PPLN晶体的入射角,使不同中心波长的基频光达到准相位匹配条件,实现倍频光波长的调谐。对带宽60 nm的锁模激光倍频得到带宽1.5 nm、中心波长532 nm的脉冲激光输出。以掺Yb锁模光纤激光作为基频光,调节PPLN晶体角度,获得了中心波长连续变化的倍频激光,入射角度调节范围0°~25°,对应的倍频光波长调谐范围531.8~535.6 nm。波长变化趋势与理论分析一致。Frequency doubling pulse laser around 532 nm was obtained through irradiating periodically poled lithium niobate(PPLN) crystal with a single mode laser beam,which emitting from a Yb-doped mode-locked fiber laser.Based on quasi-phase matching technology,the second harmonic generation(SHG)wavelength tuning can be realized by changing incident angle of fundamental wave that irradiates PPLN.Pumped by a mode-locked fiber laser which has a bandwidth of 60 nm,the pulse laser SHG was obtained from PPLN,and the output laser has a bandwidth of 1.5 nm and center wavelength of 532 nm.The SHG wavelength was continuously detuned by adjusting the angle of PPLN crystal.It worked out an angle tuning range of 0° to 25°,corresponding to the SHG wavelength tuning from 531.8 nm to 535.6 nm.The wavelength detuning is in good agreement with the theoretical analysis.

关 键 词：非线性光学 波长调谐 准相位匹配 周期性极化铌酸锂 锁模光纤激光 

分 类 号：O437[机械工程—光学工程]