High-Precision Temperature Control of Laser Crystals

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-08-09 DOI:10.3390/photonics11080745

Xiang Zhang, Hang Xu, Liwen Feng, Zhongqi Liu, Tianyi Wang, Jinqiang Xu, Shengwen Quan, Senlin Huang

引用次数: 0

Abstract

Temperature control is important in second harmonic generation (SHG) based on non-critical phase matching, which is widely used in the accelerator field to generate drive lasers. To further improve the stability of the drive laser for the DC-SRF photocathode electron gun at Peking University, a high-precision temperature control oven for lithium borate (LBO) crystals was developed. The oven’s structure was designed to minimize heat exchange with the external environment. The temperature control circuit uses a thermoelectric cooler to ensure the temperature stability of the sampling circuit. The program utilizes a cascaded proportional-integral-derivative and an anti-saturation integral algorithm to achieve high-precision temperature control. Experiments showed that fluctuation at the working temperature of the LBO crystal in this oven was within ±0.009 °C, corresponding to a root mean square (RMS) jitter of 0.003 °C, and the long-term power fluctuation of the 13.7 W green laser generated with SHG was less than 1%.

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激光晶体的高精度温度控制

温度控制在基于非临界相位匹配的二次谐波发生（SHG）中非常重要，在加速器领域广泛应用于产生驱动激光。为了进一步提高北京大学 DC-SRF 光电阴极电子枪驱动激光器的稳定性，我们开发了一种用于硼酸锂（LBO）晶体的高精度温度控制炉。烘箱的结构设计最大限度地减少了与外部环境的热交换。温度控制电路采用热电冷却器，以确保采样电路的温度稳定性。程序采用级联比例-积分-派生和抗饱和积分算法，以实现高精度温度控制。实验表明，该烘箱中 LBO 晶体工作温度的波动在 ±0.009 °C 以内，对应均方根抖动为 0.003 °C，利用 SHG 产生的 13.7 W 绿色激光的长期功率波动小于 1%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.