Abstract
Diffraction of obliquely incident Gaussian beams on waveguide
gratings with infinitely long grooves is described. The analysis is
based on the angular spectrum of the beam and on the grating response
derived from the four-wave coupled-mode theory, which simultaneously
considers all four (approximately) synchronous waves. Results
concerning the shapes of the emerging beams and their directions, the
power content, and the possibility of beam splitting could differ
significantly from those obtained by means of two-wave
coupling. The analysis method is general and can be performed on
many kinds of realistic beam shapes and applications.
© 1998 Optical Society of America
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