全固态瓦级 388 nm 紫外连续激光器

doi:10.3969/j.issn.1007-5461.2023.03.011

量子电子学报 ›› 2023, Vol. 40 ›› Issue (3): 392-399.doi: 10.3969/j.issn.1007-5461.2023.03.011

全固态瓦级 388 nm 紫外连续激光器

钱龙龙 , 沈咏 , 刘曲 , 邹宏新*

( 国防科技大学理学院, 湖南长沙 410073 )

收稿日期:2021-10-06 修回日期:2021-11-04 出版日期:2023-05-28 发布日期:2023-05-28
通讯作者: E-mail: hxzou@nudt.edu.cn E-mail:hxzou@nudt.edu.cn
作者简介:钱龙龙 (1997 - ), 河南周口人, 研究生, 主要从事非线性频率变换产生紫外或深紫外激光方面的研究。 E-mail: qianlonglong15@nudt.edu.cn
基金资助:
国家自然科学基金面上项目 (62275268), 湖南省自然科学基金重点项目 (2019JJ50743)

All-solid-state watt-level 388 nm continuous-wave ultraviolet laser

QIAN Longlong, SHEN Yong, LIU Qu, ZOU Hongxin*

( College of Science, National University of Defense Technology, Changsha 410073, China )

Received:2021-10-06 Revised:2021-11-04 Published:2023-05-28 Online:2023-05-28
Contact: Zou HongXin E-mail:hxzou@nudt.edu.cn

摘要/Abstract

摘要： 采用自行研制的776.9 nm半导体激光器作为种子源, 经过锥形半导体放大器并整形后得到2.3 W的基频光, 再利用Ⅰ类相位匹配的三硼酸锂晶体和蝶形倍频腔产生了388.4 nm紫外连续激光。分析了锥形放大器中热透镜效应对光束质量的影响, 并通过透镜、柱面镜、棱镜对光束进行整形, 提高了倍频腔的输入耦合效率。进一步通过优化倍频腔的束腰尺寸和腔参数, 提高了紫外激光二次谐波的转换效率。最终2.3 W的基频光产生940 mW的紫外倍频光输出, 倍频效率达到41%。

关键词: 非线性光学, 紫外连续激光, 二次谐波, 热透镜效应, 三硼酸锂晶体

Abstract: Using a homemade 776.9 nm semiconductor laser as seeder, a 2.3 W fundamental frequency output is obtained through amplification of a tapered amplifier (TA) and shaping. Then, a 388.4 nm continuous-wave laser is generated by the second harmonic generation (SHG) of a Class I phase matched lithium borate (LBO) crystal with an external bow-tie cavity. It is shown that the severely thermal effect of TA can change the waist position of the generated laser beam and limit the conversion efficiency of the second harmonic generator. Therefore, the thermal effect of TA is analyzed, and a laser beam shaping scheme consisted of cylindrical lens, prism pair and lens is proposed to compensate for the thermal effect. Furthermore, by optimizing the beam waist size and cavity parameters of the cavity, the conversion efficiency of the second harmonic is improved. Finally, the basic frequency input of 2.3 W can generate a ultraviolet laser output of 940 mW, with SHG efficiency of 41%.

Key words: nonlinear optics, ultraviolet continuous-wave laser, second harmonic generation, thermal lens effect, LiB3O5 crystal

中图分类号:

O437.1

钱龙龙 , 沈咏 , 刘曲 , 邹宏新 . 全固态瓦级 388 nm 紫外连续激光器[J]. 量子电子学报, 2023, 40(3): 392-399.

QIAN Longlong, SHEN Yong, LIU Qu, ZOU Hongxin. All-solid-state watt-level 388 nm continuous-wave ultraviolet laser[J]. Chinese Journal of Quantum Electronics, 2023, 40(3): 392-399.

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全固态瓦级 388 nm 紫外连续激光器

All-solid-state watt-level 388 nm continuous-wave ultraviolet laser

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