Design of a diffractive optical element for wide spectral bandwidth

Abstract

A new method for eliminating the chromatic aberration of a diffractive optical element (DOE) for wideband wavelengths is presented. The wideband-wavelength diffractive optical element (WBDOE) consists of two aligned DOE's. The use of different dispersive materials for the two DOE's eliminates chromatic aberration. The design and simulation of a WBDOE for the visible spectrum are presented.

The investigation of triple-layer diffraction optical element with wide field of view and high diffraction efficiency

“…Based on the scalar diffraction theory, when the light wave passes through the TLDOE vertically, the phase shift j(l i ) as a function of the designed wavelength l i is governed by [5] …”

“…Although 100% diffractive efficiency can be achieved at the designed wavelength, the diffraction efficiency will be dramatically decreased as the wavelength deviating away from the designed wavelength. A doublelayer DOE with high diffraction efficiency at each wavelength in the designed waveband is proposed by appropriately selecting the grating heights of the diffraction grating grooves and the combination of different dispersion optical materials [5][6][7][8]. However, the diffraction efficiency of a double-layer DOE decreases greatly when incident angle exceeds a certain value.…”

Achromatic fan-out diffractive system for white-light free-space optical interconnects

“…This fact, which has been neglected in this work, is due to the wavelength dependence of the pro le depth of the di ractive elements. A novel design for di ractive lenses that achromatize their di raction e ciency in a sandwich con guration has previously been reported [32].…”

Comparison of electromagnetic and scalar methods for evaluation of efficiency of diffractive lenses for wide spectral bandwidth

“…Unfortunately, in the case of a one-layer-relief phase microstructure, it can be performed on one wavelength only and only for one angle of incidence. To reduce the dependence of the DE in working order diffraction on a function of wavelength and angle of incidence the microstructure with multiple reliefs and layers are used (see, for example, [2][3][4]). Obviously, this technique will automatically lead to the decrease of the DE in the side diffraction orders due to the minimization of the dependence of the optical path difference on the wavelength and the angle of incidence in the predetermined range of these parameters.…”