Abstract
It is generally accepted that diffractive elements designed for
multiwavelength operation require deep surface-relief profiles. We
show, however, that thin diffractive elements can be designed to
operate with more than one wavelength. A novel, to our knowledge,
optimization technique is introduced for this purpose. The maximum
phase delay is limited to only a few multiples of 2π, and the element
can implement different functions for different
wavelengths. Examples with fan-out gratings are
discussed.
© 1999 Optical Society of America
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