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Atomic spectroscopy with squeezed light for sensitivity beyond the vacuum-state limit

Polzik, E. S. and Carri, J. and Kimble, H. J. (1992) Atomic spectroscopy with squeezed light for sensitivity beyond the vacuum-state limit. Applied Physics B: Photophysics and Laser Chemistry, 55 (3). pp. 279-290. ISSN 0721-7269. doi:10.1007/bf00325016. https://resolver.caltech.edu/CaltechAUTHORS:20200812-072714845

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Abstract

A frequency tunable source of squeezed light has been developed which is suitable for a variety of spectroscopic applications. In initial experiments continuous tunability over a range of 2 GHz has been achieved with a directly observed nonclassical noise reduction of 6 dB relative to the vacuum-state limit in a balanced homodyne detector. A process of light-induced absorption in the nonlinear crystal has been identified as the principal loss mechanism which prevents the observation of yet larger degrees of squeezing. Although our source is potentially broadly tunable over the range of wavelengths from 840 to 970 nm, the current research centers on the performance at 852 nm for spectroscopy of the D₂ line of atomic cesium. For frequency-modulated (FM) saturation spectroscopy in a vapor cell, an improvement of 3.1 dB in sensitivity relative to the usual quantum limit is demonstrated for the detection of Doppler-free resonances. When corrected for the thermal noise of the detector, the enhancement in signal-to-noise ratio brought by the squeezed field is 3.8 dB relative to the shot-noise limit set by the vacuum fluctuations of the probe field.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/bf00325016DOIArticle
ORCID:
AuthorORCID
Polzik, E. S.0000-0001-9859-6591
Additional Information:© 1992 Springer Verlag. Received 16 March 1992; Accepted 04 May 1992.
Issue or Number:3
Classification Code:PACS: 42.62.Fi; 32.80.-t; 42.50.Dv
DOI:10.1007/bf00325016
Record Number:CaltechAUTHORS:20200812-072714845
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200812-072714845
Official Citation:Polzik, E.S., Carri, J. & Kimble, H.J. Atomic spectroscopy with squeezed light for sensitivity beyond the vacuum-state limit. Appl. Phys. B 55, 279–290 (1992). https://doi.org/10.1007/BF00325016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104922
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Aug 2020 15:19
Last Modified:16 Nov 2021 18:37

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