Method of producing an inline hologram lens

Details Method of producing an inline hologram lens Method of producing an inline hologram lens

1980-05-01

1982-01-26

Corbin, John K.

350 375, G02B 532

Patent

active

043125590

ABSTRACT:
An inline hologram lens suitable for use in an optical reproducing head is formed by first preparing a mother off-axis hologram lens by exposing a photo-sensitive layer to a subject wave beam and an off-axis reference wave beam, and then developing the photo-sensitive layer; and subsequently by forming the inline hologram lens by exposing a second photo-sensitive layer to an interference pattern formed by passing an inline reference wave beam through the mother off-axis hologram lens to be incident normal to the second photo-sensitive layer while passing an off-axis subject coherent beam at an angle through said off-axis mother hologram lens to form a subject beam that is focussed a predetermined distance from the second photo-sensitive layer, and finally by developing the second photo-sensitive layer. Preferably, the mother hologram lens has a diffraction efficiency of less than unity. An optical reproducing head utilizing such an inline hologram lens includes a beam-splitter, a quarter-wave plate, the inline hologram lens, and a transparent adhesive to adhere the beam-splitter, plate, and lens to one another.

REFERENCES:
patent: 3807829 (1974-04-01), Close
patent: 4054356 (1977-10-01), Noguchi
patent: 4245882 (1981-01-01), Chang

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