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In order to understand the behavior of short-pulse amplification in CO2 systems, two physical processes have to be considered in detail. First it is necessary to understand the interaction of the radiation field with the inverted medium. This interaction becomes complicated when we are dealing with high-power amplification where we want to extract all the available energy from the inverted medium. The complication results from the fact that the leading edge of the propagating pulse experiences the highest gain, whereas later on the amplification becomes much less due to saturation. This affects not only the pulse shape but also the gain distribution under the pulse profile while propagating. In the case of a single transition where the population densities of the upper and lower level are only disturbed by the interaction of a one-dimensional optical pulse (plane wave) this problem can be treated analytically. Thereby it is assumed that the gain is not frequency dependent over the spectrum range of the pulse. The treatment of this problem by Frantz and Nodvik [10.1] gives a useful insight into the amplification of an intense short pulse.
KeywordsPulse Shape Vibrational Level Gaussian Pulse Nanosecond Pulse Inversion Density
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