Abstract
Diffraction patterns and divergence of the fundamental mode of a laser are
studied in the case of a plano–concave cavity with two-apertured
mirrors. The effects of both apertures are shown to be nonequivalent. The sizes
of their diameters control the geometry of the beam and, in particular, control
the increase or the decrease of the divergence with respect to that of the
nondiaphragmed cavity.
© 1992 Optical Society of America
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