Abstract
High-intensity multimode laser theory is used to derive the absorption coefficients for 1) a coherent light beam (probe) interacting with a possibly inhomogeneously broadened medium in the presence of an intense second corunning beam, and for 2) the sedibands of a weakly modulated light beam interacting with the medium. The general expressions are specialized to non-saturating probes and the short dipole-lifetime limit, yielding coherent pulsation-dip formulas. These are given for both homogeneous and inhomogeneous broadening and typically consist of simple power-broadened Lorentzians with widths equal to the smaller level-decay constant. The amplitude modulation case features pulsation dips twice as deep as the single-probe case, while the frequency modulation case exhibits no pulsation dip at all. Spectroscopic methods are discussed including the heterodyne advantage obtained with collinear light beams.
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Work performed as a Humboldt awardee in Germany.
Work supported in part by the Space and Missiles Systems Organization, Los Angeles, California.
Work supported by the “Deutsche Forschungsgemeinschaft”.
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Sargent, M., Toschek, P.E. & Danielmeyer, HG. Unidirectional saturation spectroscopy, I theory and short dipole lifetime limit. Appl. Phys. 11, 55–62 (1976). https://doi.org/10.1007/BF00895016
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DOI: https://doi.org/10.1007/BF00895016