Faraday effect on the Rb D 1 line in a cell with a thickness of half the wavelength of light
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Faraday Effect on the Rb D1 Line in a Cell with a Thickness of Half the Wavelength of Light A. Sargsyana*, Y. Pashayan-Leroyb, C. Leroyb, and D. Sarkisyana** a
Institute for Physical Research, National Academy of Sciences of Armenia, Ashtarak-2, 0203 Armenia Interdisciplinaire Carnot de Bourgogne, UMR CNRS 6303-Université de Bourgogne Franche-Comté, France e-mail: *[email protected], [email protected]; **[email protected], [email protected]
b Laboratoire
Received April 25, 2016
Abstract—The rotation of the radiation polarization plane in a longitudinal magnetic field (Faraday effect) on the D1 line in atomic Rb vapor has been studied with the use of a nanocell with the thickness L varying in the range of 100–900 nm. It has been shown that an important parameter is the ratio L/λ, where λ = 795 nm is the wavelength of laser radiation resonant with the D1 line. The best parameters of the signal of rotation of the radiation polarization plane have been obtained at the thickness L = λ/2 = 397.5 nm. The fabricated nanocell had a large region with such a thickness. The spectral width of the signal reached at the thickness L = 397.5 nm is approximately 30 MHz, which is much smaller than the spectral width (≈ 500 MHz) reached with ordinary cells with a thickness in the range of 1–100 mm. The parameters of the Faraday rotation signal have been studied as functions of the temperature of the nanocell, the laser power, and the magnetic field strength. The signal has been reliably detected at the laser power PL ≥ 1 μW, magnetic field strength B ≥ 0.5 G, and the temperature of the nanocell T ≥ 100°C. It has been shown that the maximum rotation angle of the polarization plane in the longitudinal magnetic field is reached on the Fg = 3 → Fe = 2 transition of the 85Rb atom. The spectral profile of the Faraday rotation signal has a specific shape with a sharp peak, which promotes its applications. In particular, Rb atomic transitions in high magnetic fields about 1000 G are split into a large number of components, which are completely spectrally resolved and allow the study of the behavior of an individual transition. DOI: 10.1134/S1063776116090156
1. INTRODUCTION The effect of rotation of the radiation polarization plane at the passage through a medium in a longitudinal magnetic field (Faraday rotation) is now actively studied in view of a technically simple implementation and numerous possible applications [1–4]. A large number of works are devoted to the creation of narrowband (a passband of 0.5–1.0 GHz) atomic optical filters based on Faraday rotation in alkali metal atomic vapor on the D1, 2 line. In atomic optical filters, a configuration with crossed polarizers is used and only a desired signal is transmitted [5–7]. The transmission spectrum of atomic optical filters can be three orders of magnitude narrower than that of interference filters. The main elements of atomic optical filters are 1– 100-mm-long spectroscopic cells filled with alkali metal vapor. Such cells are successfully applied to deter
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