Abstract
We present a modulation transfer spectroscopy (MTS) configuration based on an acousto-optic modulator by using a variant of the typical double pass structure. One beam is modulated by using an acousto-optic modulator in opposite diffraction order to cancel the carrier frequency shift and produce a modulated pump beam. The line shape performance is investigated theoretically and experimentally. Laser frequency stabilization of the proposed configuration is demonstrated for the 133Cs |62S1/2, F = 4⟩ → |62P3/2, F′ = 5⟩ transition. The Allan deviations, which are measured by using beat note signals and the three-cornered hat method, are 3.6 × 10−11 in an integration time of 100 s and approximately 4 × 10−11 in a longer integration time.
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