HUANG Jia-qiang, GU Yuan, ZHANG Yin, WANG Yan-hui, LIU Shu-qin, DONG Tai-qian

(School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China)

Abstract: We use one DFB laser diode (780 nm) as the pumping source, which is based on a homemade traditional rubidium frequency standard with the discharge lamp assembly removed. The laser frequency is locked to the ⁸⁷Rb cycling transition (5²S_1/2, F＝2→5²P_3/2, F＝3) by means of traditional saturation absorption locking technique and the microwave rubidium frequency standard locking loop is accomplished. The initial short-term stability of the rubidium clock is measured to be 3.7×10^-12 τ^-1/2 (1~100 s).

Key words: Rb frequency standard; laser-pumping; saturated absorption spectrum; frequency stability