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Quantum Electronics

Magnetooptic resonances in the output spectrum of a wideband laser with a strongly absorbing medium and use of these resonances to determine high optical densities

А. П. Войтович, О. Е. Костик, В. В. Машко

Published Mar 31, 1993• 0 citations
Publisher

Abstract

An explanation has been found for the resonances which form in absorption dips in the output power of a wideband laser with an amplitude-anisotropic resonator containing a strongly absorbing atomic medium in a magnetic field. These resonances are caused by rotation of the polarization plane of the light in the medium. It is suggested that these resonances be used to measure high optical densities of media. This method has been used to experimentally determine the optical density of potassium vapor at the frequencies of the resonance doublet at various temperatures.

DOI
10.1070/qe1993v023n03abeh002984

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An explanation has been found for the resonances which form in absorption dips in the output power of a wideband laser with an amplitude-anisotropic resonator containing a strongly absorbing atomic medium in a magnetic field. These resonances are caused by rotation of the polarization plane of the light in the medium. It is suggested that these resonances be used to measure high optical densities of media. This method has been used to experimentally determine the optical density of potassium vapor at the frequencies of the resonance doublet at various temperatures.
An experimental investigation was made of the spectral and energy characteristics of the radiation emitted by a dye laser with a ring resonator containing an absorbing medium (potassium vapor) in which an anisotropy was induced by a strong external optical wave. Narrowing of the dye output radiation to about 10???2 nm and locking of the emission spectrum to one- and two-photon absorption lines of the potassium vapor were observed. An investigation was made of the locking efficiency for different polarizations of the strong wave.
A theoretical analysis is made of the resonant interaction between a traveling monochromatic light wave of arbitrary intensity and polarization and the 1/21/2 and 10 transitions in gas atoms in a magnetic field. An analysis is made of the influence of atomic collisions and coherence of the Zeeman sublevels of the terms on the structure of nonlinear magnetooptic resonances in the amplitude and polarization characteristics of the wave. Some features of nonlinear magnetooptic resonances for laser excitation of atoms from the ground state are noted. A study is made of the Faraday rotation and self-rotation of the polarization ellipse of the radiation as a function of the detuning of the wave frequency, the saturation parameter, and the optical density of the gas. The stability of the polarization of light in the medium is discussed. It is noted that these laws may be used to analyze and control the radiation characteristics of lasers and amplifiers when the level of saturation of a resonant gaseous medium in a magnetic field is high.
A high-Q resonator and linear polarization of the output radiation are assumed. Calculations are made of the contributions of the real and imaginary parts of the nonlinear polarizability of an absorbing medium in the resonator to each of the parameters governing the output intensity (loss factor, saturation parameter) and detuning of the output frequency from the natural frequency of the resonator (coefficients describing effects of the mode pushing and pulling type). The results are reported of an experimental determination of the output power at the wavelength of an absorption line as a function of the intensity of the applied magnetic field and it is shown that these results agree well with the calculations.
The rotation of the polarization direction of linearly polarized light produced by the nonlinear magneto-optic effect has been proposed as a sensitive measure of small magnetic fields. In this paper, the advantages of this technique in optically thick media for precision magnetometry are discussed. Results are presented for measurements of this rotation for resonant light in optically dense Rb vapour under various conditions, with and without buffer gas. The sensitivity of the measurements of small magnetic field is investigated as a function of laser frequency, laser power, beam diameter and atomic density for D 1 line of 87Rb.