Abstract

Amplitude-modulated heterodyne polarization spectroscopy was applied for detecting spectral features with small transition probabilities. The intrinsic sensitivity of Doppler-free polarization spectroscopy can be enhanced toward the shot-noise limit, using a frequency-offset saturating beam together with high-frequency chopping. Heterodyne detection of weak transitions with absorption in the 10−6 range was achieved. Examples are given of spin-forbidden transitions in Na2 and of two-photon taransitions in Na2 and Na.

© 1985 Optical Society of America

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