周期极化钽酸锂倍频窄谱线全光纤连续激光放大器特性  

Second Harmonic Generation Characteristics of Continuous Wave Narrow-Linespectrum All Fiber Amplifier in PPSLT

作　　者：焦梦丽[1,2] 吕新杰[3] 刘驰[1] 袁烨[3] 漆云凤[1] 丁亚茜[1,2] 赵刚[3] 周军[1] 

机构地区：[1]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [2]中国科学院研究生院,北京100049 [3]南京大学物理学院,江苏南京210093

出　　处：《中国激光》2012年第3期24-28,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60907045);国家863计划(2011AA030201);上海市科技启明星计划(09QB1401700)资助课题

摘　　要：通过准相位匹配技术,采用1μm波段高功率窄谱线连续光纤激光放大器抽运高二次谐波转换效率周期性极化晶体,是实现高光束质量、小型化、高功率连续绿光激光器的一个非常有前途的方向。实验自主研发了高效率主振荡功率放大(MOPA)全光纤保偏放大模块,获得中心波长为1064.25nm,线宽为0.035nm的30 W连续线偏振激光,并以此作为基频光抽运国产周期极化钽酸锂(PPSLT)晶体进行了外腔单通倍频实验。保持PPSLT晶体的控制温度为145.6℃,在抽运光功率为21.5W时得到了2.1W的绿光输出。实验分析了温度、基频光功率密度和Boyd-Kleinman聚焦因子对倍频光转换效率的影响。实验过程中没有出现饱和现象,进一步提高抽运功率有望获得更高功率的绿光。The combination of 1 μm continuous wave（CW）,high power,narrow-linespectrum fiber amplifier and the periodically poled materials with high second harmonic generation efficiency provides a compact and high efficiency approach for wavelength conversion with high beam quality.A polarization maintaining all fiber amplifier with the master-oscillator power amplifier（MOPA） is built.30 W CW fiber laser is obtained with 0.035 nm linewidth at 1064.25 nm center wavelength.Single-pass,second-harmonic generation of the fiber laser in periodically poled stoichiometric lithium tantalate（PPSLT） made in China is demonstrated.Stabilizing the temperature at 145.6 ℃,2.1 W green light is achieved at the pump fundamental power of 21.5 W.The effects on the second harmonic generation efficiency produced by temperature,input power density,and Boyd-Kleinman focusing parameter are analysed.Higher power green light can be expected by increasing the fundamental power because the saturation effect is not observed.

关 键 词：激光器 主振荡功率放大 双包层光纤激光 倍频 周期极化钽酸锂晶体 

分 类 号：O437.1[机械工程—光学工程]