摘要
为满足精密测量对高稳定激光单色光源功率的要求,研制了全封闭、一体化结构的高功率碘稳频He-Ne激光系统。对该系统所采用的饱和光谱探测原理、吸收峰识别与锁定方法以及激光波长的稳频效果进行了研究。首先,介绍了三次谐波方法探测饱和吸收光谱的基本原理,分析了其消除功率背景的方法。接着,分析了碘稳频激光中一体化谐振腔的稳定性,详细讨论了谐振腔轴向膨胀和横向非对称形变对输出功率的影响。然后,分析了激光输出功率与碘分子饱和吸收峰之间的对应关系,介绍了利用二次谐波信号实现吸收峰识别的可行性,并展示了高稳定谐振腔的长时间锁定能力。最后,分析了高功率碘稳频He-Ne激光波长的稳定度与复现性。实验结果表明:高功率碘稳频He-Ne激光波长抖动标准差为33 kHz,1 000 s稳定度达到4.1×10^(-13);三个月内激光波长的复现性达到3.3 kHz (7.0×10^(-12)),与国际计量委员会推荐的频率差为3.0 kHz。
In order to meet the requirement of high output power of the laser monochromatic light source in the precision measurement, a high-power iodine stabilized He-Ne laser system with a fully enclosed, integrated structure was developed. The principle of saturation spectral detection, the method of absorption peak recognition and locking and the frequency stability of iodine stabilized laser were studied. Firstly, the basic principle of detecting saturation absorption spectrum of iodine molecular using the three harmonic method was introduced,and its mechanism of eliminating the power background was analyzed. Then, the stability of the integrated resonant cavity in the iodine stabilized laser was demonstrated, and the effects of axial expansion and lateral asymmetric deformation on the output power were discussed in detail. After that, the correspondence between the profile of laser output power and the iodine molecular saturation absorption peaks was presented, the feasibility of using the secondary harmonic signal to achieve absorption peak recognition was introduced, and the long-term locking ability of high-stability resonant cavity was demonstrated. Finally, the wavelength stability and reproducibility of high-power iodine stabilized He-Ne laser were analyzed. The experimental results showed that the standard deviation for the frequency jitter of high-power iodine stabilized He-Ne laser was 33 kHz, the stability at 1 000 s and the reproducibility in three months were 4.1×10^(-13) and 3.3 kHz(7.0×10^(-12)), respectively.Its absolute frequency was 3.0 kHz lower than the recommended value by the International Committee for Weights and Measures(CIPM).
作者
王建波
殷聪
石春英
王捍平
蔡山
舒慧
Wang Jianbo;Yin Cong;Shi Chunying;Wang Hanping;Cai Shan;Shu Hui(National Institute of Metrology,Beijing 100013,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2021年第4期112-118,共7页
Infrared and Laser Engineering
基金
国家重点研发计划(2016YFF0200302)。
关键词
碘稳频激光
激光波长标准
波长稳定性
光频标
HE-NE激光
iodine stabilized laser
laser wavelength standard
wavelength stability
optical frequency standard
He-Ne laser
