Abstract
Study of pattern formation in the transverse section of lasers with plane cavity mirrors of infinite size shows that the fundamental solutions are transverse travelling waves [1]. In the case of Optical Parametric Oscillators (OPO), instead, rolls [2] or squares, or hexagons [3] are the fundamental patterns close to threshold. With curved cavity mirrors, however, both cases of lasers and OPO produce outputs which look like a combination of empty cavity modes, generally of Gauss-Laguerre type. These are the most commonly observed experimentally; a typical example of output intensity is shown in Figure 1 for the laser case.
© 1996 Optical Society of America
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