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Modulation-free sub-Doppler laser frequency stabilization to molecular iodine with a common-path, two-color interferometer

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Abstract

Recently, a simple common-path, two-color interferometer has been used for Doppler-free saturated dispersion spectroscopy of iodine. We have used such a set-up to stabilize a Nd:YAG laser for the first time, to our knowledge. This method requires only a small number of low-cost optical components compared to frequency modulation techniques. We have measured a root Allan variance of 5·10-12 for 0.2 s, and below 5·10-11 for integration times up to 300 s.

©2004 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Schematic of frequency stabilized Nd:YAG laser with a common-path, two-color interferometer. For further details see text.
Fig. 2.
Fig. 2. Bandpass-filtered modulation-free dispersion signal of the a 1 component of the R(56)32-0 iodine line.
Fig. 3.
Fig. 3. Low-pass-filtered error signals of the R(56)32-0 iodine line for frequency stabilization.
Fig. 4.
Fig. 4. Time series of the beat frequency of the stabilized and unstabilized Nd:YAG laser (a). Stabilized laser frequency measurement on a fine frequency scale (b).
Fig. 5.
Fig. 5. Linear spectral density (a) and root Allan variance (b) of the stabilized and unstabilized laser frequency.
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