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Frequency-modulation spectroscopy of rubidium atoms with an AlGaAs diode laser

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Abstract

Frequency-modulation (FM) spectroscopy has been performed on the D2 transitions of rubidium atoms with an AlGaAs diode laser at 780 nm. Doppler-broadened hyperfine-structure transitions of 85Rb and 87Rb were resolved with no residual amplitude-modulation-induced background signal by modulating the injection current of the laser diode at a low frequency (20–50 MHz) compared with the Doppler width. To obtain Doppler-free spectra, we combined FM spectroscopy with saturation spectroscopy. The results show that the FM spectroscopy technique is sensitive and should be useful for high-resolution spectroscopy, although the resolution was instrument limited and unusual double peaks were observed.

© 1987 Optical Society of America

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