Nonlinear effects in optical pumping of a cold and slow atomic beam
| Autor: | N. N. Bezuglov, S. Birindelli, Ennio Arimondo, A. Fioretti, Gholamreza Shayeganrad, Daniel Comparat, Maria Allegrini, Donatella Ciampini, Francesco Tantussi, M. Viteau, M. Bruvelis, A. Ekers, Francesco Fuso, Nicolò Porfido, Irene Guerri |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
education.field_of_study Population 02 engineering and technology saturation spectroscopy mutilevel atoms cesium laser absorption: photoionization intesity systems state trap 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Numerical integration law.invention Optical pumping law Ultracold atom 0103 physical sciences Physics::Atomic Physics Laser power scaling Atomic physics 010306 general physics 0210 nano-technology education Hyperfine structure Excitation |
| Zdroj: | Physical review. A 92 (2015): 043408–043408. doi:10.1103/PhysRevA.92.043408 info:cnr-pdr/source/autori:Porfido, N.; Bezuglov, N. N.; Bruvelis, M.; Shayeganrad, G.; Birindelli, S.; Tantussi, F.; Guerri, I.; Viteau, M.; Fioretti, A.; Ciampini, D.; Allegrini, M.; Comparat, D.; Arimondo, E.; Ekers, A.; Fuso, F./titolo:Nonlinear effects in optical pumping of a cold and slow atomic beam/doi:10.1103%2FPhysRevA.92.043408/rivista:Physical review. A/anno:2015/pagina_da:043408/pagina_a:043408/intervallo_pagine:043408–043408/volume:92 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.92.043408 |
| Popis: | By photoionizing hyperfine (HF) levels of the Cs state $6{\phantom{\rule{0.16em}{0ex}}}^{2}{P}_{3/2}$ in a slow and cold atom beam, we find how their population depends on the excitation laser power. The long time (around $180\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s})$ spent by the slow atoms inside the resonant laser beam is large enough to enable exploration of a unique atom-light interaction regime heavily affected by time-dependent optical pumping. We demonstrate that, under such conditions, the onset of nonlinear effects in the population dynamics and optical pumping occurs at excitation laser intensities much smaller than the conventional respective saturation values. The evolution of population within the HF structure is calculated by numerical integration of the multilevel optical Bloch equations. The agreement between numerical results and experiment outcomes is excellent. All main features in the experimental findings are explained by the occurrence of ``dark'' and ``bright'' resonances leading to power-dependent branching coefficients. |
| Databáze: | OpenAIRE |
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