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).
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malcuit841.pdf (354 KB)
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.
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