Title :
The pulsed optically pumped Rb frequency standards in National Time Service Center
Author :
Zhi-jing, Du ; Shou-gang, Zhang ; Jie, Liu ; Xiao-feng, Li ; Dan-dan, Liu ; Wen-xiang, Xue
Author_Institution :
Key Lab. of Time & Freq. Primary Stand., Nat. Time Service Center, Xi´´an, China
Abstract :
In this paper we report a laboratory prototype of pulsed optically pumped (POP) rubidium frequency standard. In POP operation the pumping, interrogation, and detection phases are separated in time, avoiding the coupling between microwave and optical coherence. The POP 87Rb vapor-cell frequency standard was studied experimentally based on the detection of free induction microwave signal or optical absorption signal. Ramsey fringes were obtained based on 87Rb in buffer gas, with FWHM of 65Hz and 150Hz for microwave and optical central Ramsey fringes respectively. The atomic quality factor was on the order of 108. With microwave detection, the achieved frequency stability was 1.2×10-12τ-1/2(τ=1~100s).
Keywords :
Q-factor; atomic clocks; frequency stability; frequency standards; light absorption; light coherence; microwave detectors; optical pumping; phase separation; rubidium; POP interrogation; POP pumping; Rb; atomic quality factor; buffer gas; detection phases; free induction microwave signal; frequency 150 Hz; frequency 65 Hz; microwave central Ramsey fringes; microwave coherence; microwave detection; national time service center; optical absorption signal; optical central Ramsey fringes; optical coherence; phase separation; pulsed optically pumped rubidium frequency standard; vapor-cell frequency standard; Atom optics; Atomic clocks; Masers; Microwave amplifiers; Microwave oscillators; Optical pumping;
Conference_Titel :
Frequency Control Symposium (FCS), 2012 IEEE International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4577-1821-2
DOI :
10.1109/FCS.2012.6243579
