Evidence for degenerate mirrorless lasing in alkali metal vapor: forward beam magneto-optical experiment
| Autor: | Guzhi Bao, Dmitry Budker, Dimitra Kanta, Aram Papoyan, H. H. Azizbekyan, Aleksandr Khanbekyan, Arne Wickenbrock, Marina Movsisyan, Svetlana Shmavonyan |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Atomic Physics (physics.atom-ph) Linear polarization FOS: Physical sciences Resonance Condensed Matter Physics Population inversion Laser Polarization (waves) 01 natural sciences Ray Atomic and Molecular Physics and Optics Physics - Atomic Physics law.invention 010309 optics Light intensity law 0103 physical sciences Atomic physics 010306 general physics Lasing threshold |
| Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics. 52:195003 |
| ISSN: | 1361-6455 0953-4075 |
| Popis: | We report an experimental observation of degenerate mirrorless lasing in forward direction under excitation of a dilute atomic Rb vapor with a single linearly polarized cw laser light resonant with cycling Fe > Fg atomic D2 transitions. Light polarized orthogonally to the laser light is generated for the input light intensity exceeding a threshold value of about 3 mW/cm^2. Application of a transverse magnetic field directed along the input light polarization reveals a sharp about 20 mG wide magnetic resonance centered at B = 0. Increasing the incident light intensity from 3 to 300 mW/cm^2, the generated light undergoes rapid amplitude increase followed by a decline and resonance broadening. Such nonlinear behavior of the observed magnetic resonance is attributed to the population inversion on optical transitions between magnetic sublevels established under linearly polarized excitation. We present observations that indicate that a combination of nonlinear-optical effects occurs in this system, including degenerate mirrorless lasing and four-wave mixing. |
| Databáze: | OpenAIRE |
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