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
(050.1970) Diffraction and gratings : Diffractive optics
Original Manuscript: August 6, 1998
Revised Manuscript: November 17, 1998
Published: May 10, 1999
Tasso R. M. Sales and Daniel H. Raguin, "Multiwavelength operation with thin diffractive elements," Appl. Opt. 38, 3012-3018 (1999)