Power scaling of intra-cavity Nd:YAG/LBO laser at 532 nm by birefringence compensation

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-08 DOI:10.1088/1612-202x/ad59fa

Shuai Li, Zijun Fang, Majun Peng, Zhanda Zhu, Hong Lei, Qiang Li

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Abstract

We report an effective method to reduce the impact of polarization state changes caused by thermal birefringence in intra-cavity frequency-doubled laser. The laser consists of a diode side pumped Nd:YAG module, an acousto-optic modulator Q-switch, and an LBO crystal used for SHG generation in 532 nm laser. The effect of thermal birefringence originated by the Nd:YAG rod with concave-shape end surfaces on SHG efficiency is compensated by the insertion of a λ/8 plate into the cavity. At the repetition frequency of 9 kHz, the 532 nm laser achieves a maximum output power of 23.8 W, a pulse duration of 60 ns (FWHM), and a beam quality factor of M_x ² × M_y ² = 1.52 × 1.43. Compared with the λ/4 plate and without plate, the maximum average power of the laser with the λ/8 plate has increased by 22.7% and 66.4%, respectively, the beam quality factor has also been greatly improved correspondingly. This method provides a new solution for lasers to compensate thermally induced birefringence.

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通过双折射补偿实现 532 纳米波长腔内 Nd:YAG/LBO 激光器的功率缩放

我们报告了一种减少腔内倍频激光器中热双折射引起的偏振态变化影响的有效方法。该激光器由一个二极管侧泵浦 Nd:YAG 模块、一个声光调制器 Q 开关和一个用于在 532 nm 激光器中产生 SHG 的 LBO 晶体组成。由于 Nd:YAG 棒的端面呈凹形，其产生的热双折射对 SHG 效率的影响可通过在腔体中插入一个 λ/8 板来补偿。在 9 kHz 的重复频率下，532 nm 激光器的最大输出功率为 23.8 W，脉冲持续时间为 60 ns (FWHM)，光束品质因数为 Mx2× My2 = 1.52 × 1.43。与使用 λ/4 板和不使用 λ/4 板的激光器相比，使用 λ/8 板的激光器的最大平均功率分别提高了 22.7% 和 66.4%，光束质量因数也相应得到了大幅提高。这种方法为激光器补偿热致双折射提供了一种新的解决方案。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.