一种新型铷原子频标腔泡系统的光频移研究

LIGHT SHIFT IN A NEW CAVITY-CELL ASSEMBLY FOR RUBIDIUM ATOMIC FREQUENCY STANDARDS

在自行研制的一种小型化微波腔的基础上,新近研制出采用分离滤光技术的气泡型铷频标腔泡系统。研究该种腔泡系统的光频移特性,确定了该腔泡系统的零光频移和零温度系数点。系统的光频移系数为7.2×10^(-12)/10％。零光频移温度为68℃,比传统的腔泡系统低5～10℃。它不依赖于吸收泡参数,可以通过改变滤光泡参数进行调整,从而简化了参数优化过程。

Based on a miniaturized microwave cavity developed by ourselves and the separated filter technique, a new type of cavity-cell assembly for gas cell rubidium frequency standards was made. The light shift characteristics of the assembly were studied, and the conditions for minimum light shift and temperature coefficient were determined. The operating temperature for minimum light shift was found to be 68 ℃ for the new assembly, 5～10 ℃ lower than that for the conventional systems. The light shift coefficient under the optimized conditions was 7.2×10^(-12) /10%. The light shift effect in the new assembly was independent on the parameters of the absorption cell, thus could be minimized by optimizing only the parameters of the filter cell so that the parameter optimizing process was greatly simplified.