dorsal/arxiv
View SchemaMeasurement of the parity violating 6S-7S transition amplitude in cesium achieved within 2 \times 10^{-13} atomic-unit accuracy by stimulated-emission detection
| Authors | J. Guéna, M. Lintz, M. -A. Bouchiat |
|---|---|
| Categories | |
| ArXiv ID | physics/0412017 |
| URL | https://arxiv.org/abs/physics/0412017 |
| DOI | 10.1103/PhysRevA.71.042108 |
Abstract
We exploit the process of asymmetry amplification by stimulated emission which provides an original method for parity violation (PV) measurements in a highly forbidden atomic transition. The method involves measurements of a chiral, transient, optical gain of a cesium vapor on the 7S-6P_{3/2} transition, probed after it is excited by an intense, linearly polarized, collinear laser, tuned to resonance for one hyperfine line of the forbidden 6S-7S transition in a longitudinal electric field. We report here a 3.5 fold increase, of the one-second-measurement sensitivity, and subsequent reduction by a factor of 3.5 of the statistical accuracy compared with our previous result [J. Gu\'ena et al., Phys. Rev. Lett. 90, 143001 (2003)]. Decisive improvements to the set-up include an increased repetition rate, better extinction of the probe beam at the end of the probe pulse and, for the first time to our knowledge, the following: a polarization-tilt magnifier, quasi-suppression of beam reflections at the cell windows, and a Cs cell with electrically conductive windows. We also present real-time tests of systematic effects, consistency checks on the data, as well as a 1% accurate measurement of the electric field seen by the atoms, from atomic signals. PV measurements performed in seven different vapor cells agree within the statistical error. Our present result is compatible with the more precise Boulder result within our present relative statistical accuracy of 2.6%, corresponding to a 2 \times 10^{-13} atomic-unit uncertainty in E_1^{pv}. Theoretical motivations for further measurements are emphasized and we give a brief overview of a recent proposal that would allow the uncertainty to be reduced to the 0.1% level by creating conditions where asymmetry amplification is much greater.
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"abstract": "We exploit the process of asymmetry amplification by stimulated emission\nwhich provides an original method for parity violation (PV) measurements in a\nhighly forbidden atomic transition. The method involves measurements of a\nchiral, transient, optical gain of a cesium vapor on the 7S-6P_{3/2}\ntransition, probed after it is excited by an intense, linearly polarized,\ncollinear laser, tuned to resonance for one hyperfine line of the forbidden\n6S-7S transition in a longitudinal electric field. We report here a 3.5 fold\nincrease, of the one-second-measurement sensitivity, and subsequent reduction\nby a factor of 3.5 of the statistical accuracy compared with our previous\nresult [J. Gu\\\u0027ena et al., Phys. Rev. Lett. 90, 143001 (2003)]. Decisive\nimprovements to the set-up include an increased repetition rate, better\nextinction of the probe beam at the end of the probe pulse and, for the first\ntime to our knowledge, the following: a polarization-tilt magnifier,\nquasi-suppression of beam reflections at the cell windows, and a Cs cell with\nelectrically conductive windows. We also present real-time tests of systematic\neffects, consistency checks on the data, as well as a 1% accurate measurement\nof the electric field seen by the atoms, from atomic signals. PV measurements\nperformed in seven different vapor cells agree within the statistical error.\nOur present result is compatible with the more precise Boulder result within\nour present relative statistical accuracy of 2.6%, corresponding to a 2 \\times\n10^{-13} atomic-unit uncertainty in E_1^{pv}. Theoretical motivations for\nfurther measurements are emphasized and we give a brief overview of a recent\nproposal that would allow the uncertainty to be reduced to the 0.1% level by\ncreating conditions where asymmetry amplification is much greater.",
"arxiv_id": "physics/0412017",
"authors": [
"J. Gu\u00e9na",
"M. Lintz",
"M. -A. Bouchiat"
],
"categories": [
"physics.atom-ph",
"hep-ph"
],
"doi": "10.1103/PhysRevA.71.042108",
"title": "Measurement of the parity violating 6S-7S transition amplitude in cesium achieved within 2 \\times 10^{-13} atomic-unit accuracy by stimulated-emission detection",
"url": "https://arxiv.org/abs/physics/0412017"
},
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