Hybrid polymer-on-glass integrated optical diffractive structures for wavelength discrimination

We present novel compact planar configurations for wavelength discriminatio n. These configurations include multiple diffractive optical elements (DOEs ) that are recorded in very thick photopolymer layers that are coated on on e planar transparent substrate. The design, material parameters, recording procedures and experimental results for configurations are presented. For a configuration that was designed to discriminate three closely separated wa velengths, the results reveal that the wavelength separation could be as lo w as 3 nm at an operating wavelength of 1567 nm, for 80 mum thick photopoly mer layers. The crosstalk between adjacent wavelengths was less than 2% for one DOE that is comprised of three sub-DOEs, each designed for a different wavelength. (C) 2001 Elsevier Science B.V. All rights reserved.