Phys. Rev. Lett. 68, 3020–3023 (1992)Spectroscopy with squeezed lightReceived 29 January 1992; published in the issue dated 18 May 1992 A frequency-tunable source of squeezed light is employed for spectroscopic measurements of atomic cesium. Relative to the usual quantum limit associated with vacuum-state fluctuations, enhanced sensitivity is demonstrated for the detection of Doppler-free resonances in saturation spectroscopy, with an improvement of 3.1 dB directly observed and 3.8 dB inferred after correcting for detector thermal noise. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.68.3020
DOI:
10.1103/PhysRevLett.68.3020
PACS:
42.62.Fi, 32.80.-t, 42.50.Dv
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