Method for constructing an optical head by varying a hologram pattern
AssigneePencom International Corporation
InventorWai-Hon Lee
Life of this patent
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Abstract
A method for constructing an optical head having a holographic diffraction grating for focusing a light beam on a photodetector is disclosed. The photodetector is first mounted in the optical head and the distance between the position where the hologram lens will be placed and the photodetector is measured. The holographic grating pattern which is etched onto the hologram leans is then created so that it will focus the laser beam at the measured distance. The hologram lens is then mounted in the optical head.
Claims10
A method for aligning a photodetector and a diffraction grating, in an optical head which uses said diffraction grating to direct a light beam onto said photodetector, comprising the steps of:
- mounting said photodetector in a housing for said optical head;
- measuring a distance from a position for said diffraction grating to a surface of said mounted photodetector;
- creating a grating pattern on said diffraction grating to produce, in cooperation with other elements of said optical head, one or more focused spots of diffracted beams at said distance;
- and
- mounted said diffraction grating in said optical head at said position.
Dependencies are inferred from the claim text.