Abstract
The evolution of the intensity profile of transversely excited atmospheric laser pulses is investigated within the intensity moment formalism. The beam quality factor is used to study the mode evolution. Attention is focused on the influence of both the gas mixture and the diameter of an intracavity diaphragm placed to attenuate higher-order modes. The degree of accuracy that can be attained by approximating the laser field amplitude by means of the lower-order terms of a Hermite–Gauss expansion is also analyzed. In particular, a bound for the truncation error is given in terms of two time-resolved spatial parameters, namely the beam width and the parameter.
© 2001 Optical Society of America
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