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Journal of Experimental and Theoretical Physics

Stark broadening of spectral lines of atoms in the field of multimode laser radiation

N. F. Perel'Man

Published Sep 1, 1980• 0 citations
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In a helium glow discharge, the A. C. Stark shift of the 4 3S 1 → 2 3P0,1,2 transition (λ ≅ 4 713 Å) induced by nonresonant interaction of the 4 3S and 4 3P levels with a multimode CO2 laser field is measured as a function of laser intensity in the range IL < 35 MW/cm 2. Departure from the linear intensity dependence given by second order perturbation theory is observed for IL > 2 MW/cm2. A three-level atom model taking into account the interaction with the laser field in a non perturbative way agrees with the experiment. Strong broadening is also detected for IL > 1 MW/cm2. This broadening grows with IL until a quasi-continuum spreading over 50 Å is observed for IL = 33 MW/cm2. This broadening results from amplitude and phase fluctuations of the laser field modes during interaction. For IL = 33 MW/cm2 the recorded 4 713 Å spectral line shape reflects the statistical distribution of the mode amplitudes.

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The Effect of Multimode Laser Operation on Multiphoton Absorption by Atoms

Joel I. Gersten, Marvin H. Mittleman

Springer eBooks•Jan 1, 1976•6 citations
An experimental investigation was made of the broadening of the D lines and of the two-photon absorption line (4S1/2–6S1/2) of potassium vapor subjected to ruby laser radiation. A dye laser beam was used as a probe and this made it possible to record simultaneously all three absorption lines. The measurements were carried out for different polarizations and geometries of the exciting and probe radiations. The observed broadening was attributed to the high-frequency Stark effect in the strong field of the incident wave.
In a helium glow discharge, the A. C. Stark shift of the 4 3S 1 → 2 3P0,1,2 transition (λ ≅ 4 713 Å) induced by nonresonant interaction of the 4 3S and 4 3P levels with a multimode CO2 laser field is measured as a function of laser intensity in the range IL < 35 MW/cm 2. Departure from the linear intensity dependence given by second order perturbation theory is observed for IL > 2 MW/cm2. A three-level atom model taking into account the interaction with the laser field in a non perturbative way agrees with the experiment. Strong broadening is also detected for IL > 1 MW/cm2. This broadening grows with IL until a quasi-continuum spreading over 50 Å is observed for IL = 33 MW/cm2. This broadening results from amplitude and phase fluctuations of the laser field modes during interaction. For IL = 33 MW/cm2 the recorded 4 713 Å spectral line shape reflects the statistical distribution of the mode amplitudes.