A. Hariri and S. Sarikhani
Laser and Optics Research Department, Nuclear Science and Technology Research Institute, North Kargar Avenue,
P.O. Box 11365-8486, Tehran, Iran
Received April 4, 2012
Abstract—Based on our recent realization concerning the geometrically dependent gain coefficient in self-ter-
minating gas lasers, where it is shown that in one-dimensional approach it is z-dependent, we applied the gain
formulation to explain, both numerically and analytically, the behavior of the amplified spontaneous emission
(ASE) output energy vs. excitation length of the active medium. As an example, we used experimental mea-
surements reported for a KrF excimer laser. In the approach it was realized that it is needed to present a gain-
profile slightly lower than the gain-profile deduced from different reports appeared in the literature, where it is
also indicating that the contribution of the ASE on the laser output is significant and it is the active medium
length dependent. The present analytical presentation of the ASE output energy behavior, also, introduces a
generalized formulation compared to that appeared in the literature. With this approach it is possible to remove
most of the present ambiguities existing on understanding of the ASE behavior.
DOI: 10.1134/S1054660X12120109
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