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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 22, Iss. 1 — Jan. 1, 2005
  • pp: 21–28

Proposal for high-precision atomic-parity-violation measurements by amplification of the asymmetry by stimulated emission in a transverse electric and magnetic field pump–probe experiment

Jocelyne Guéna, Michel Lintz, and Marie-Anne Bouchiat  »View Author Affiliations

JOSA B, Vol. 22, Issue 1, pp. 21-28 (2005)

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Amplification by stimulated emission of radiation provides an interesting means for increasing the sensitivity of atomic-parity-violation (APV) measurements in a pump–probe configuration well adapted to the 6S-7S Cs transition. It takes advantage of the large number of atoms excited along the path of the pump beam. In the longitudinal electric field configuration currently exploited in our ongoing APV measurement, this number is limited only by the total voltage sustainable by the Cs vapor. To overcome this limit we consider, both theoretically and experimentally, the possibility of performing the measurements in a transverse electric field configuration requiring a much lower voltage. We discuss the necessarily different nature of the observable and the magnetoelectric optical effects that come into play. These condition modifications of the experimental configuration with, in particular, the application of a transverse magnetic field. We suggest the possibility of rotating the transverse direction of the fields so as to suppress systematic effects. With a long interaction length a precision reaching 0.1% in a quantum-noise-limited measurement can be expected, limited only by the necessity of operating below the threshold of spontaneous superradiant emission of the excited medium. Were we to approach this limit, however, we could greatly amplify the asymmetry using triggered superradiance.

© 2005 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(120.2130) Instrumentation, measurement, and metrology : Ellipsometry and polarimetry
(300.6210) Spectroscopy : Spectroscopy, atomic

Jocelyne Guéna, Michel Lintz, and Marie-Anne Bouchiat, "Proposal for high-precision atomic-parity-violation measurements by amplification of the asymmetry by stimulated emission in a transverse electric and magnetic field pump-probe experiment," J. Opt. Soc. Am. B 22, 21-28 (2005)

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  36. The transverse and longitudinal field experiments that we consider here differ not only in the field direction, but in the polarization of the excitation beam, circular versus linear, and the hyperfine transitions involved, 6SF=4 -->7SF=4 -->6P3/2,F=5 versus 6SF=3 -->7SF=4 -->6P3/2,F=4 . But it turns out that the overall change in the k coefficient is small and can be neglected.
  37. We have chosen to make here a comparison between two situations differing by the magnitude of L , but such that the APV asymmetries are of equal size |Ppv |= |thetapv |. Indeed, it is not identical to increase A by increasing L rather than the field magnitude. Increasing the field magnitude increases A at the expense of a reduction of Ppv or thetapv . This reinforces the risks of systematic effects arising for instance from stray fields, which are amplified like the APV asymmetry.
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