dorsal/arxiv
View SchemaNoise spectroscopy of non-linear magneto optical resonances in Rb vapor
| Authors | M. Martinelli, P. Valente, H. Failache, D. Felinto, L. S. Cruz, P. Nussenzveig, A. Lezama |
|---|---|
| Categories | |
| ArXiv ID | physics/0310068 |
| URL | https://arxiv.org/abs/physics/0310068 |
| DOI | 10.1103/PhysRevA.69.043809 |
Abstract
Nonlinear magneto-optical (NMO) resonances occurring for near-zero magnetic field are studied in Rb vapor using light-noise spectroscopy. With a balanced detection polarimeter, we observe high contrast variations of the noise power (at fixed analysis frequency) carried by diode laser light resonant with the 5S$_{1/2}(F=2) \to 5$P$_{1/2}(F=1) $ transition of $^{87}$Rb and transmitted through a rubidium vapor cell, as a function of magnetic field $B$. A symmetric resonance doublet of anti-correlated noise is observed for orthogonal polarizations around $B=0 $ as a manifestation of ground state coherence. We also observe sideband noise resonances when the magnetic field produces an atomic Larmor precession at a frequency corresponding to one half of the analysis frequency. The resonances on the light fluctuations are the consequence of phase to amplitude noise conversion owing to nonlinear coherence effects in the response of the atomic medium to the fluctuating field. A theoretical model (derived from linearized Bloch equations) is presented that reproduces the main qualitative features of the experimental signals under simple assumptions.
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"abstract": "Nonlinear magneto-optical (NMO) resonances occurring for near-zero magnetic\nfield are studied in Rb vapor using light-noise spectroscopy. With a balanced\ndetection polarimeter, we observe high contrast variations of the noise power\n(at fixed analysis frequency) carried by diode laser light resonant with the\n5S$_{1/2}(F=2) \\to 5$P$_{1/2}(F=1) $ transition of $^{87}$Rb and transmitted\nthrough a rubidium vapor cell, as a function of magnetic field $B$. A symmetric\nresonance doublet of anti-correlated noise is observed for orthogonal\npolarizations around $B=0 $ as a manifestation of ground state coherence. We\nalso observe sideband noise resonances when the magnetic field produces an\natomic Larmor precession at a frequency corresponding to one half of the\nanalysis frequency. The resonances on the light fluctuations are the\nconsequence of phase to amplitude noise conversion owing to nonlinear coherence\neffects in the response of the atomic medium to the fluctuating field. A\ntheoretical model (derived from linearized Bloch equations) is presented that\nreproduces the main qualitative features of the experimental signals under\nsimple assumptions.",
"arxiv_id": "physics/0310068",
"authors": [
"M. Martinelli",
"P. Valente",
"H. Failache",
"D. Felinto",
"L. S. Cruz",
"P. Nussenzveig",
"A. Lezama"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.69.043809",
"title": "Noise spectroscopy of non-linear magneto optical resonances in Rb vapor",
"url": "https://arxiv.org/abs/physics/0310068"
},
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