Abstract
This comment aims to report and correct a mistake in the paper by Desurvire
(J. Lightw. Technol., vol. 8,
no. 10, pp. 1517–1527, Oct. 1990) with regard to the expression of the
complex susceptibility of quasi-three-level laser systems. The derived susceptibility
formula contradicts the assumption of thermal equilibrium between sublevels
within each manifold and leads to the wrong conclusion that the real and imaginary
parts of the susceptibility of saturated materials do not verify the Kramers–Kronig
relations (KKR). The corrected formula for the susceptibility is hereby proposed.
The poles of the susceptibility obtained with the new formula are all located
in the upper half plane of the complex plane, in accordance with the principle
of causality. Hence, the KKR should be valid in the saturated regime.
© 2008 IEEE
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