积分球冷原子钟的探测光频率和强度噪声  

Frequency and Intensity Noises of Probe Laser in Integrating Sphere Cold Atom Clock

作　　者：王秀梅[1,2] 孟艳玲 李琳[1] 王亚宁[1,2] 于明圆 王鑫 肖玲[1] 万金银 成华东[1] 刘亮[1] 

机构地区：[1]中国科学院上海光学精密机械研究所量子光学重点实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《中国激光》2017年第9期277-282,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(11604353);中国科学院青年创新促进会资助项目

摘　　要：对积分球冷原子钟(ISCAC)探测光的频率和强度噪声进行了理论分析和实验研究。通过功率稳定和杂散光去除,探测光相对强度噪声的功率谱密度在高频区域(0.1~10kHz)最大被压缩了15dB,同时探测光频率噪声对ISCAC频率稳定度的影响被降低至9τ^(-1/2)×10^(-15),其中τ为积分时间。理论分析结果表明,目前探测光频率噪声对ISCAC频率稳定度的影响为2.5τ^(-1/2)×10^(-13)。提出了一种减小探测光频率噪声影响的实验方案,即在钟周期一定时适当增大探测时间。采用这种方法,可以将探测光频率噪声对ISCAC频率稳定度的影响减小至9.4τ^(-1/2)×10^(-14)。The frequency and intensity noise of the probe laser in the integrating sphere cold atom clock （ISCAC） are studied theoretically and experimentally. The power spectral density of the relative intensity noise of the probe laser in the high frequency region （0.1-10 kHz） is maximally compressed by 15 dB with the methods of stabilization of laser power and the removal of stray light, and simultaneously the influence of the probe laser frequency noise on the ISCAC frequency stability is decreased to 9τ-1/2 × 10^15 where r is the integration time. The theoretical analysis results show that, up to now, the influence of the probe laser frequency noise on the ISCAC frequency stability is 2.5τ-1/2 × 10^-13 . Thus a scheme to reduce the influence of the probe laser frequency noise is proposed, that is, the detection time is increased appropriately in a certain clock cycle. With this method, the influence of the probe laser frequency noise on the ISCAC frequency stability can be reduced to 9.4τ-1/2 × 10^-14 .

关 键 词：激光光学 冷原子钟 频率稳定度 探测光噪声 

分 类 号：O439[机械工程—光学工程]