Method and apparatus for making and utilizing a holographic bifo

Details Method and apparatus for making and utilizing a holographic bifo Method and apparatus for making and utilizing a holographic bifo

1985-04-25

1987-08-18

Arnold, Bruce Y.

350 372, G02B 532

Patent

active

046872825

ABSTRACT:
A laser system, and method therefor, is disclosed which uses a single holographic bifocal lens element, comprised of non-overlapping first and second holographic lenses, to perform a plurality of different functions in the system. The field lens converges and focuses the first reconstructed beam on a desired target. Light reflected from the target back to the second holographic lens causes that lens to generate and focus a second reconstructed beam at a collection point. The holographic bifocal lens element is fabricated by initially producing a lenslet holographically by recording the interference of two point sources on a first portion of the same side of a hologram recording medium and then producing a collection lens holographically by recording the interference of two point sources on opposite sides of the hologram recording medium.

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patent: 4253723 (1981-03-01), Kojima et al.
patent: 4333006 (1982-06-01), Gorin et al.
patent: 4421379 (1983-12-01), Grumet et al.

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