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Soviet Journal of Quantum Electronics

Shifts of the emission frequency of a third-harmonic-stabilized laser due to saturation of the refractive index

Yurii M Malyshev, Yu G Rastorguev, Alexandre N. Titov

Published Jun 30, 1984• 5 citations
Publisher

Abstract

A laser with an internal absorption cell stabilized with the aid of its third harmonic is investigated. Considerable frequency shifts are observed when the gas pressure in the cell, depth of modulation, and intensity of the saturating field are altered. These shifts are attributed to the appearance of lens-like properties in the absorbing medium under the action of a resonant field with a Gaussian intensity distribution.

DOI
10.1070/qe1984v014n06abeh005187

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A laser with an internal absorption cell stabilized with the aid of its third harmonic is investigated. Considerable frequency shifts are observed when the gas pressure in the cell, depth of modulation, and intensity of the saturating field are altered. These shifts are attributed to the appearance of lens-like properties in the absorbing medium under the action of a resonant field with a Gaussian intensity distribution.
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The saturation of resonant third-harmonic generation in absorbing and phase-matched high-density systems is investigated theoretically as well as experimentally. It is shown that the saturation is determined by the two-photon absorption [imaginary part of ${\ensuremath{\chi}}_{S}^{(3)}(\ensuremath{\omega})$]. It gives rise to a depletion of the fundamental wave and leads to a change of the level populations and of the effective refractive index destroying the phase matching. This has to be compared with nonresonant systems which are limited by the Kerr effect, the intensity-dependent changes of the refractive index [real part of ${\ensuremath{\chi}}_{S}^{(3)}(\ensuremath{\omega})$]. Optimum conditions for resonant systems are reported.
A study was made of the modulation of the coherent emission spectrum by spatial gratings of the refractive index, produced by the dye laser field in an absorbing medium inside the resonator. It was found that the frequencies of the reflection maxima of a nonlinear mirror resulting from the inhomogeneity of the refractive index along the direction of propagation of the light wave were in agreement with the frequencies satisfying the conditions for the maxima of interference reflection in the presence of an additional plane in the resonator.