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[转载]CPB仪器与测量栏目最新发文 | 面向复杂环境应用的VCSEL泵浦高功率全固态激光器

已有 292 次阅读 2022-9-1 11:46 |系统分类:论文交流|文章来源:转载


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文章信息

A 658-W VCSEL-pumped rod laser module with 52.6% optical efficiency

Xue-Peng Li(李雪鹏), Jing Yang(杨晶), Meng-Shuo Zhang(张梦硕), Tian-Li Yang(杨天利), Xiao-Jun Wang(王小军), and Qin-Jun Peng(彭钦军)

Chin. Phys. B, 2022, 31 (8):  084207

Abstract

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文章介绍

垂直腔面发射激光(VCSEL)以其束散角小、光斑对称的优势,在消费电子、激光通信与照明等领域已获得广泛应用;由于其同时具备良好的波长稳定性与线宽抑制能力,用作泵浦源可为全固态激光提供稳定的能量输入。但随着平均功率的提升,VCSEL自身较高的热阻与泵浦耦合的两大难题限制了其在高功率场景下的使用,一直以来都以低平均功率的脉冲激光应用为主。


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图1. 衬底与热沉流道优化后VCSEL阵列结构示意图


中科院理化所激光团队的李雪鹏博士等在杨晶研究员和王小军研究员的指导下,通过芯片低热阻衬底材料的筛选与宏通道热沉的优化设计,突破了VCSEL阵列在大热流运转下的结温控制难题。进一步通过增益模块内部泵浦距离、维数、泵浦耦合及光学匀化器件的优化,突破了大发光区、小发散角的发光芯片的高效耦合难题,将侧面泵浦全固态激光增益模块输出平均功率大幅提升至600 W以上,并实现了百瓦级近衍射极限的激光输出,该两项指标均达到国际领先水平。


该方案可充分发挥VCSEL芯片低温漂系数的优势,当系统冷却液的温度从16 ℃变化到26 ℃时,最高输出功率变化量小于± 3.1%,远小于普通边发射激光作为泵浦源时±1 ℃的温控精度要求,这也意味着该类激光大幅放宽热管理模块的流量与控温要求;此外,其采用宏通道冷却结构设计,冷却介质无须高规滤芯自净化与电导率控制。


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图2. VCSEL泵浦全固态激光器的输出功率和光-光转换效率曲线


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图3. VCSEL泵浦全固态激光器在16~26 ℃温度范围内温度稳定性的测试曲线


综上,VCSEL泵浦全固态激光为高功率激光设备的轻小型化提供了一种新的优选方案;并在激光的工业、野外及空间环境等复杂应用场景中,具有广阔的应用前景。


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