CO_2脉冲激光偏频锁定系统

A Simple Offset Frequency Locking Technique for Pulsed CO_2 Lasers

综述了目前脉冲激光偏频锁定的发展状况 ,总结了各种脉冲激光偏频锁定的方法 ,并提出了宽带全数字鉴频方法 ,带宽达到 2～ 10 0MHz,以及以鉴频器为基础的简单偏频锁定系统设计。介绍了电光外调制CO2 脉冲激光与连续CO2 激光之间的偏频锁定实验 ,光脉冲重复频率为 10kHz ,脉宽为 5 μs。实验频率锁定结果良好 ,频率稳定度为 1 2 7× 10 -7(阿仑方差 )。

This paper first briefly overviews the current development of optical pulse offset frequency locking techniques, then summarizes the methods of discriminating frequency on optical pulse offset locking used in the techniques, and finally presents a wide-band all-digital frequency discriminating method (band width: 2～100 MHz) and design of a simple offset frequency locking system on the basis of the frequency discriminator. In addition,it also introduces the experiments on offset frequency locking between CW CO 2 laser and a pulsed CO 2 laser of which the pulse was produced by using a CdTe switch outside the optical cavity (optical pulse width: 5 μs and its repetition rate: 10 kHz). The experimental results were satisfactory, the beat frequency stability was 1.27×10 -7 (Allen variance).