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Observation of a spectral hole due to population oscillations in a homogeneously broadened optical absorption line

Lloyd W. Hillman, Robert W. Boyd, Jerzy Krasinski, and C. R. Stroud, Jr.

Opt. Comm. 45, 416 (1983).

A dip has been observed in the absorption profile of the homogeneously broadened green absorption band of ruby for frequencies near that of a saturating, CW laser beam. The shape and depth of the hole thus produced have been measured using weak amplitude modulation sidebands as a probe, and are found to be in good agreement with theoretical predictions. These predictions are based on a model that ascribes the origin of the hole to the periodic modulation of the ground state population at the beat frequency between the pump and probe beams. The theory includes the effect of pump depletion. Holes as narrow as 37 Hz (HWHM) have been observed.

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