Dependence of the frequency shift of the optical-microwave double resonance signal in the Cs D/sub 2/ line on the pumping frequency and power of a GaAs semiconductor laser

The OMDR (optical-microwave double resonance) effect in the Cs D/sub 2/ line was studied for realizing a gas-cell-type Cs atomic frequency standard. A glass cell containing Cs with buffer gases (Ar/N/sub 2/=1.26, total pressure=39 torr) was placed in a TE/sub 012/ mode microwave cavity at a temperature of 45 degrees C and was pumped using a GaAs semiconductor laser frequency locked to an external interferometer tuned to the 6P/sub 3/2/ (F=2,3,4) from 6S/sub 1/2/(F=3) transition. The OMDR signal appearing at the resonance to the F=4 from 3 hyperfine transition of the 6S/sub 1/2/ state shifted with detuning of the laser frequency and with change of the laser and microwave powers. The dependence of the shift on these variables around an optimum operating condition was obtained as, Delta nu /sub MW/(Hz)=-(0.31+or-0.02) (1+(0.44+or-0.15) ( Delta P/sub L//P/sub L/)) Delta nu /sub L/ (MHz)-10( Delta V/sub MW//V/sub MW/).<
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