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The linear (small-signal) and nonlinear temporal response of CO2laser media was studied. Experimental results of the amplification of optical pulses whose duration is comparable to the inverse gain-bandwidth of the amplifying medium are described. Pulse narrowing, a consequence of nonlinear amplification, was observed. Computer calculations based upon a two-level model incorporating phenomenologically CO2rotational level coupling are compared with experimental observations.
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Brian McFarland (1973) studied this question.
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