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Institute of Optics

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Saturation and inverse-saturation absorption line shapes in alexandrite

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

JOSA B 1, 73 (1984).


Through the use of modulation spectroscopy the authors have measured the absorption spectrum experienced by a weak probe beam in the presence of a saturating pump beam at two different wavelengths within the broad homogeneous absorption band of alexandrite. At 584 nm the absorption saturates at high pump intensities, and a hole (of width 612 Hz) appears at frequencies near that of the pump laser. However, at 457 nm the absorption demonstrates the inverse of normal saturation because of strong excited-state absorption, and an antihole appears at the pump frequency. These results are in good quantitative agreement with the predictions of a model that ascribes the origin of these spectral features to the temporal modulation of the ground-state population at the beat frequency between the pump and the probe beams. These population oscillations are treated properly within a rate-equation approximation in which the amplitude modulation of the total optical intensity caused by the beating of the pump and the probe beams is taken into account.


Click here to download the .pdf version of the paper malcuit841.pdf (354 KB)


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