Abstract
For a laser beam diffracted by a hard-edge aperture, propagation of
the beam width, defined by the second-order moment of its irradiance
distribution truncated according to the self-convergent-width
criterion, obeys the familiar hyperbolic law. It is demonstrated
numerically that, with the self-convergent-width approach, the
beam-propagation parameters for three beam types (Gaussian,
Hermite–Gaussian, and flattened Gaussian) diffracted by
hard-edge apertures can be determined with the
second-moment-based procedure that is recommended by the present
draft standard only for unapertured laser beams.
© 2000 Optical Society of America
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