摘要
在被动式光频标中,用于钟激光稳频的超稳谐振腔具有由腔体布朗运动导致的热噪声,由此限制了钟激光的线宽,成为目前被动式光频标稳定度提高的主要局限因素。主动式光频标利用原子在坏腔中的受激辐射得到频标信号,因而对腔牵引效应具有抑制作用,可以极大地降低谐振腔布朗热噪声对频标稳定度的影响。在此基础上,好坏腔双波长主动光频标将在同一个谐振腔内实现Nd:YAG晶体1 064nm和铯原子(Cs)1 470nm好坏腔双波长输出,其中1 064nm好腔激光通过Pound-Drever-Hall(PDH)技术稳频,从而实现主动光钟谐振腔腔长(主谐振腔腔长)的锁定。与此同时,作为钟跃迁信号的铯1 470nm坏腔激光由于对腔牵引效应的抑制作用,其稳定度可在PDH稳频的基础上得到进一步提高。目前实验中已经实现了好坏腔双波长输出,并对好坏腔信号的功率、线宽等特性分别进行了测试,下一步将进行好腔信号的PDH锁频工作,以期实现超窄线宽的光频标。
In passive optical frequency standards, the clock laser is stabilized by the Pound-Drever-Hall （PDH） technique,and the Brownian noise of the cavity limits the laser linewidth and the stability of optical frequency standards currently. The active optical frequency standards, which utilize the atomic stimulated emission in the bad-cavity regime, can break the limitation of the cavity-length noise for the suppression of cavity-pulling effect. On this base, the dual-wavelength good-bad cavity active optical frequency standard will simultaneously realize the Nd：YAG 1 064 nm and Cs 1 470 nm in a single cavity,which works in good and bad cavity regime,respectively. The 1 064 nm good cavity laser is then frequency stabilized by the PDH technique,thus realizing the main cavity length stabilization. Meanwhile, the stabilization of Cs 1 470 nm bad cavity laser,which works as the clock signal, is expected to be further improved on the basis of PDH stabilization, because of the suppression of cavity pulling effect. The dual-wavelength good-bad cavity signal has already been realized by experiment, and the characteristics such as power and linewidth have been measured. Next,we will work on the PDH stabilization of the good cavity signal, hoping to achieve the optical frequency standard with ultra-narrow linewidth.
作者
史田田
潘多
陈景标
SHI Tian-tian;PAN Duo;CHEN Jing-biao(Institute of Quantum Electronics,School of Electronics Engineering and Computer Science Peking University,Beijing 100871,China;State Key Laboratory of Advanced Optical Communication System,Network School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China)
出处
《时间频率学报》
CSCD
2018年第3期185-189,共5页
Journal of Time and Frequency
基金
国家自然科学基金资助项目(91436210)
关键词
主动光频标
好坏腔双波长
腔牵引效应
PDH稳频技术
active optical frequency standards
dual wavelength
cavity pulling effect
PDH technique
