Patent ID: 6583934
Filing Date: 2003-06-24
Classification: G02B,G03F

Abstract:
An optical wavelength selection apparatus comprising a surface-relief diffraction grating assembly, a collimating lens assembly for collimating optical beams to said surface-relief diffraction grating assembly, and a focusing lens assembly for focusing beams diffracted from said surface-relief diffraction grating assembly, wherein said surface-relief diffraction grating assembly is comprised of a substrate and, bound to such substrate, a photoresist surface-relief diffraction grating, wherein said surface-relief diffraction grating assembly has an initial diffraction efficiency, and wherein, after said surface-relief diffraction grating assembly has been subjected to a temperature of 85 degrees centigrade and a relative humidity of 85 percent for 1,000 hours, said surface-relief diffraction grating assembly has a diffraction efficiency that is less than 6 percent different from said initial diffraction efficiency.