摘要
利用一个中心波长范围1052.82～1053.12 nm的可调谐半导体激光器和一个波长范围为1053.10～1053.20 nm的窄线宽光纤激光器进行拍频实验。介绍了拍频信号探测的基本原理,设计了实验光路,经过宽频放大器进行信号放大后,采用高频示波器观察到周期10 ns,信号振幅4 mV左右的稳定拍频信号,实现了两种不同类型独立激光器输出光束的拍频测量。利用分光棱镜和F-P腔扫描干涉仪设计了一个两激光光束频率实时对准装置,可以在拍频测量的同时进行激光频率相对漂移的监控,解决了快速频率对准问题。并针对激光器自身频率稳定性较低的情况,提出了采用计算机自动控制实现自动频率对准与频率跟踪的方案。
An experiment on beat frequency between two independent beams generated by two different types of laser was carried out. One is a wavelength tunable semiconductor laser with central wavelength tunable range of 1052.82-1053.19, nm, and the other is a narrow line width fiber laser with wavelength of 1053.10-1053.20 nm. The foundamental principle of beat frequency signal detection is introduced, and the experimental setup is established. Stable and repeatable beat frequency signal with a period of approximate 10 ns and amplitude of 4 mV is achieved by high frequency oscillograph after amplified by wide-frequency amplifier. Beamsplitting prism and an F-P cavity sweep interferometer are utilized to achieve real-time frequency alignment which can monitor relative frequency shift and measure beat frequency simultaneously. A scheme of auto alignment through computer control is proposed in case of low laser frequency stability.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第2期285-289,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(60508002)资助项目
关键词
激光技术
拍频
独立激光器
laser technique
beat frequency
independent beams
