Method of and apparatus for forming focusing diffraction gratings for integrated optics

摘要

An apparatus and method is disclosed for making unchirped holographic diffraction gratings that are formed from curved lines in a thin film. First and second beams of coherent optical radiation are respectively focused to first and second focal lines (g,f) which lie in plane (x,y) that is substan- tialiy perpendicular to a planar photo-sensitve material (5) upon which the two beams interact to form an interference pattern.