METHOD OF FORMING FOCUSING DIFFRACTION GRATINGS FOR INTEGRATED OPTICS

摘要

METHOD OF FORMING FOCUSING DIFFRACTION GRATINGS FOR INTEGRATED OPTICS of the Dislcosure The present invention relates to an apparatus and method for forming an unchirped optical interference pattern with curved lines in a planar photosensitive material. The apparatus is comprised of a generator for generating first and second beams of coherent optical radiation. A focusing unit is provided for focusing the first beam to a first focal line at a predetermined position. A second focusing unit is provided for focusing a second beam to a second focal line at a predetermined position. The second focal line is coplanar with the first focal line and defines a first plane. A support is provided for supporting a planar piece of photosensitive material oriented in a second plane substantially perpendicular to the first plane at predetermined distances from the first and second lines whereby the first and second beams interact with the photosensitive material to form an interference pattern composed of equally spaced, curved lines in the photosensitive material.