基于单块周期极化铌酸锂晶体级联三倍频的440nm蓝光固体激光器  

440nm solid-state blue laser produced by a monolithic periodically poled lithium niobate crystal based on cascaded third-harmonic generation

作　　者：张旭光 王卫民[1] 鲁燕华[1] 许夏飞 张雷[1] 任怀瑾[1] 刘芳[1] 孙军[4,5,6] 阮旭 闫雪静[1,2] 孙舒娟 

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]中国工程物理研究院研究生院,北京100088 [3]中国工程物理研究院高能激光科学与技术实验室,四川绵阳621900 [4]南开大学物理科学学院,天津300071 [5]南开大学弱光非线性光子学教育部重点实验室,天津300457 [6]山西大学极端光学协同创新中心,太原030006

出　　处：《强激光与粒子束》2018年第4期25-29,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61575099);中国工程物理研究院院长基金项目(201501023)

摘　　要：阐述了一种基于单块周期极化铌酸锂晶体级联三倍频实现440nm蓝光输出的实验方案。根据周期极化铌酸锂晶体的Sellmeier方程以及倍频与和频的相位匹配条件,在一块周期极化铌酸锂晶体上设计了两段不同的极化周期,使其在同一工作温度下能分别实现倍频与和频,在先后经过倍频与和频后,实现级联三倍频输出。实验采用Nd:YAG产生的1319nm光作为基频光,重频400Hz,脉宽110ns,横向和纵向光束质量因子分别为1.81和2.65。耦合进周期极化铌酸锂晶体后,出射光中检测到660nm的红光和440nm的蓝光。通过调整工作温度和入射基频光功率,得到2.4mW的最大蓝光输出,此时工作温度55.5℃,基频光功率530mW。实验结果验证了单块晶体实现级联三倍频440nm蓝光输出的可行性。A 440 nm solid-state blue laser produced by aperiodically poled lithium niobate(PPLN)crystal based on cascaded third-harmonic generation(THG)is introduced.According to Sellmeier equation and phase-matching conditions of secondharmonic generation(SHG)and sum-frequency generation(SFG),two different poling periods of PPLN were designed to realize SHG and SFG at the same working temperature,and then the cascaded THG can be realized through SHG and SFG.The fundamental laser was produced by Nd:YAG,and had a 110 ns pulse width at 400 Hz pulse repetition rate with a measured beam quality of M_x^2=1.81 and M_y^2=2.65.It was coupled in PPLN and the 660 nm and 440 nm laser were detected after it passed through the crystal.The maximum output power of 440 nm laser was 2.4 mW where the working temperature was 55.5℃,and the power of 1319 nm laser was 530 mW.It is proved that a cascaded THG 440 nm blue laser can be realized by this method and it can realize a high power and high efficiency blue laser after optimization.

关 键 词：固体激光器 级联三倍频 周期极化晶体 

分 类 号：TN248.1[电子电信—物理电子学] O437.1[机械工程—光学工程]