Abstract
We discuss two methods (Zeeman modulation and Doppler modulation) for locking the frequency of a single-mode cw laser to an atomic absorption line. These methods do not require the laser frequency to be modulated directly. In the first scheme the absorption frequency of the atom is modulated via the Zeeman effect; in the second scheme the laser frequency is modulated indirectly via the Doppler effect in an atomic beam. We used the two methods successfully to lock two dye lasers to the transitions 6S1/2 → 7S1/2 and 7S1/2 → 15P3/2 in atomic cesium.
© 1988 Optical Society of America
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