Abstract
There has long been a need for a convenient quantitative measure of the mode quality of a laser beam, as any laser user who has argued about whether the specified power for his laser was reached at the same time as the specified mode already knows. The literature treats the properties of pure high-order transverse modes, but real lasers put out superpositions of such modes which most theoretical treatments do not handle well. Recently Sasnett1,2 and Siegman3 described the propagation of a mixture of high-order modes by a model which gives
© 1990 Optical Society of America
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