便携式633nm激光波长评价系统研究

Study on a portable 633nm laser wavelength evaluation system

利用光学拍频法可实现稳频He-Ne激光波长稳定度的测量以及波长不确定度的评定。报道了一种可应用于测量现场的便携式633nm激光波长评价系统,介绍了拍频测量技术原理、激光波长评价系统的基本构成以及与非便携式的传统拍频系统测量激光波长的比对结果。波长评价系统对传统光学拍频光路部分进行了改进并集成为一个便携测量系统,系统采用了全新设计的集成式光学拍频模块、小型化高精度频率计以及频谱监测仪器实现了高信噪比拍频信号的产生、计数与监测,并自主开发了拍频测量数据采集、处理与分析软件。实验结果表明该系统能够在测量现场实现激光波长的稳定度以及不确定度评价,提升了现场测量的便捷性以及测量效率。

The optical beat method can be used to measure the wavelength stability of frequency-stabilized He-Ne laser and evaluate the wavelength uncertainty. A portable wavelength evaluation system for 633 nm laser used in measurement site is reported. The principle of beat frequency measurement technology, the basic structure of laser wavelength evaluation system and the comparison results with non-portable traditional beat frequency system are introduced. The wavelength evaluation system improves the traditional optical beat optical path and integrates it into a portable measurement system. The system uses a newly designed integrated optical beat module, a miniaturized high-precision frequency meter and a spectrum monitoring instrument to achieve the generation, counting and monitoring of beat signal with high signal-to-noise ratio, and independently develops the beat measurement data acquisition, processing and analysis software. The experimental results show that the system can realize the stability and uncertainty evaluation of laser wavelength in the measurement site, and improve the convenience and efficiency of field measurement.