被动型CPT原子钟光源系统的设计与实现

Design and realization of light source system for passive CPT atomic clock

简要介绍了相干布局数囚禁(CPT)原子钟的机理,分析了典型的CPT原子钟的系统构成。在此基础上,针对CPT原子钟的特点,以Rb原子钟为设计对象,设计并制作了一种可出射稳定激光频率并能与其他CPT原子钟相兼容的光源系统。该光源系统采用热电致冷器(TEC)对激光器进行温度控制,利用直接数字频率合成(DDS)技术和锁定放大(LIA)技术实现激光器光频稳定。测试结果表明,光源系统温度对波长的控制精度为0.001 2 nm,在此条件下,系统可以很好地完成激光光频的锁定。

This paper presents the principle of coherent population trapping （CPT） atomic clocks and describes a typical CPT clock system. Then the design of a light source system is designed and realized. This system uses thermal electrical cooler （TEC） to stabilize the temperature of the laser and uses direct digital synthesis （DDS） and lock-in amplifier techniques to stabilize the laser wavelength. Test results show that this system could control the wavelength in a range of 0. 0012 nm using the temperature stabilizing principle; and under this condition the light wavelength could be stabilized on the resonance line very well.