Two-frequency Pumping in 87Rb Atomic Beam Frequency Standard with Laser Pumping/Detection for Space Application

We present our study on a two-frequency laser pumped
⁸⁷
Rb atomic beam frequency standard for space applications. Two-frequency pumping was studied experimentally with using D2-line for the most efficient scheme (2-2' sigma; 1-1' pi) and proposed by us (2-2' sigma; 1-0' sigma) scheme. The achieved efficiency for two-frequency pumping using a new scheme was equal to 95%. In the shot noise limit we could achieve instability of sigma
_y
(tau) les 1ldr10
^-13
ldr tau
^-1/2
Rb atomic beam frequency standard.