Patent ID: 6577582
Filing Date: 2003-06-10
Classification: G11B,H01S

Abstract:
A method for fabricating a stacked optical pickup head, the method comprising:providing a substrate, which comprises a plurality of photo-detecting systems arranged in a cell array, and each of the photo-detecting systems comprises a light source and a multi-element photodetector formed thereon, wherein the light source and the multi-element photodetector are used in the stacked optical pickup head to allow accessing data stored in an optical data storage medium at a desired position; performing a fabrication process to form a preliminary diffractive optical element (DOE) stack, which comprise a plurality of functional layers used for performing a desired function of a DOE stack, wherein the preliminary DOE stack comprises a plurality of DOE cells arranged in a regular array associating in space with the cell array of the photo-detecting systems; slicing the array of the DOE cells into a plurality of individual strips of DOE cells; precisely locating the individual strips of DOE cells on the substrate so that the DOE cells are aligned to the cells of the cell array of the photo-detecting systems; dicing the substrate and the preliminary DOE stack into a plurality of individual stacked pickup heads with respect to the DOE cells.