Influence of radiation intensity on resonant Faraday rotation in potassium vapor

Raphael Kh. Drampyan; M. E. Movsessian

doi:10.1117/12.375287

28 December 1999 Influence of radiation intensity on resonant Faraday rotation in potassium vapor

Raphael Kh. Drampyan, M. E. Movsessian

Proceedings Volume 4060, New Trends in Atomic and Molecular Spectroscopy; (1999) https://doi.org/10.1117/12.375287
Event: New Trends in Atomic and Molecular Spectroscopy, 1999, none, Russian Federation

Abstract

The Faraday effect in potassium vapor pumped by nanosecond pulses of near resonant laser radiation is studied experimentally. The input radiation with linewidth 3 cm^-1 had a central frequency v_p equals 13055 cm^-1 which was 12 cm^-1 higher than 4S_1/2 - 4P_3/2 atomic transition frequency v₀ equals 13043 cm^-1. The strong spectral broadening of pump radiation allowed to observe the Faraday rotation at frequencies v_{+/- 1} equals v₀ +/- 2.5 cm^-1 located closer to the atomic resonance where the rotation was high. The decrease of Faraday rotation from 150 degree(s) to 20 degree(s) with the increase of the intensity of pump radiation from 2 (DOT) 10⁵ to 10⁷ W/cm² has been measured. The saturation of 4S_1/2 - 4P_3/2 transition is considered as a cause of suppression of Faraday rotation. The contributions of one photon resonance absorption, as well as of multiphoton processes, caused by more intense off resonant part of the broadened pump radiation (having frequency detuning 12 cm^-1), to saturation of resonant transition is discussed. The experimental results are compared with theoretical calculations performed.

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Raphael Kh. Drampyan and M. E. Movsessian "Influence of radiation intensity on resonant Faraday rotation in potassium vapor", Proc. SPIE 4060, New Trends in Atomic and Molecular Spectroscopy, (28 December 1999); https://doi.org/10.1117/12.375287

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KEYWORDS

Potassium

Absorption

Polarization

Chemical species

Multiphoton processes

Magnetism

Scattering

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