高效率单通倍频实现610 W连续波单模绿光输出  

610-W Continuous-Wave Single-Mode Green Laser Output Based on Highly Efficient Single-Pass Frequency Doubling

作　　者：苏梦琪 尤阳 全昭[1] 沈辉[1] 李秋瑞[1] 陈汝风 漆云凤[1,2] Su Mengqi;You Yang;Quan Zhao;Shen Hui;Li Qiurui;Chen Rufeng;Qi Yunfeng(Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

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]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2021年第13期207-210,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(61705243);广东省重点领域研发计划(2018B090904001)。

摘　　要：基于窄线宽线偏振光纤激光单通倍频方案获得了610 W单模绿光输出,倍频效率达到56.27%,光束质量M2为1.05。这是目前报道的基于单通倍频方案获得数百瓦级连续波绿光激光输出的最高效率,可进一步通过两路绿光偏振合束实现千瓦级高亮度绿光激光输出。Objective High-power blue-green laser light sources are widely applied in the welding of highly reflective materials(e.g., copper and its alloys), pumping Ti: sapphire lasers, deep ultraviolet laser generation, semiconductor processing, and underwater optical communication and detection. High-power blue-green lasers are mainly derived from blue semiconductor lasers, disk laser frequency doubling, and narrow-linewidth fiber laser frequency doubling. Compared to blue LDs and disc lasers, a fiber laser has the advantages of all-fiber structure, high efficiency, easy heat dissipation, and flexibility. A fiber laser with a 1-μm band kW-level near-diffraction-limit narrow linewidth and full polarization maintenance is an ideal fundamental-frequency light source for high-efficiency frequency doubling and high output power. This paper introduces a high-efficiency green laser based on single-pass frequency doubling of a polarization-maintaining fiber laser.Methods Figure 1 shows experimental principle.Based on the master oscillator power amplifier cascaded amplification technology,we achieved a fundamental light source with an approximate output power of 1.1 kW and a beam quality at the near-diffraction-limit.The linewidth was~20 GHz(~0.077 nm)and the polarization extinction ratio was better than 15 dB.We selected a non-critical phase-matched lithium triborate(LBO)crystal as the frequency doubling crystal cut at angles ofθ=90°andφ=0°.The acceptance linewidth and matching temperature of the non-critical phase matching LBO crystal for the fundamental-frequency light were theoretically calculated.Highefficiency frequency multiplication can be obtained by optimizing the focal length of the focusing lens and the crystal control temperature.Results and Discussions The calculated acceptance linewidths of the 40-mm and 60-mm LBO crystals were inversely proportional to crystal length.The focal length of the focusing lens and the crystal working temperature were selected as 400 mm and ~150 ℃,respectively.The difference betwe

关 键 词：激光光学 倍频 相位匹配 绿光激光 光纤激光 

分 类 号：TN248[电子电信—物理电子学]