Abstract
We observed hyperfine structures of the 4D5/2 state of 85Rb atoms and applied them to the frequency stabilization of a laser diode by using the double resonance optical pumping (DROP). The hyperfine structures of the 4D5/2 states of 85Rb atoms were highly resolved in the Rb vapor cell. We compared the DROP with the optical–optical double resonance (OODR) in the 5S1/2–5P3/2–4D5/2 ladder-type system of 85Rb atoms. When we stabilized the frequency of a laser diode to the hyperfine structure of the 5P3/2(F″=4)–4D5/2(F″=3) transition by using the DROP spectrum, the frequency stability was approximately 2.3×10−12 after 100s.
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