Fabrication and testing of binary-phase Fourier gratings for nonuniform array generation

Abstract

This effort desciibes the fabrication and testing of binary-phase Fourier gratings designed to generate an incoherent anay of output source points with nonuniform user-defined intensities, symmetric about the zeroth order. Like Dammann fanout gratings, these binary-phase Fourier gratings employ only two phase levels to generate a defined output array. Unlike Dammann fanout gratings, these gratings generate an array of nonunifom, userdefined intensities when projected into the far-field regime. The paper describes the process of design, fabrication, and testing for two different version of the binary-phase grating; one designed for a 12 pm wavelength, referred to as the Long-Wavelength Infimed (LWIR) grating, and one designed for a 5 pm wavelength, referred to as the Mid-Wavelength Infked Grating (MWIR).