Method for Holographic Correction of Beams of Coherent Light.
Patent, Filed 5 Dec 86, patented 7 Nov 89,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A method for producing desired changes in a beam of coherent light radiating at lambda 1, comprising the steps of a splitting a beam of coherent light radiating at lambda 1, correcting one of the beams to achieve a desired wavefront and recombining this beam with the first, where a record medium I is placed such that the beams are separated by an angle determined by Braggs law and the line spacing of the interference pattern formed by the two beams b developing the first medium such that a diffraction grating of spacing d1 is recorded in a material, specifically sensitive to lambda 1, which will become the master c illuminating the master with a second wavelength lambda 2, selected by choice of a second medium which possesses very high diffraction efficiency. The second beam is split into two parts. The first is directed to the master. This diffracted order is recombined with the second beam. These beams are separated by an angle determined by Braggs law and the line spacing of the interference pattern formed by the two beams. The record of the second medium II is placed at this jucture. A second grating with grating spacing d2 is recorded in this medium containing a record of the first hologram diffracted from the master, which forms the working hologram and d illuminating the working hologram with the original beam at lambda 1, at an incidence angle specific to the grating spacing d2 and lambda 1, wherein the desired wavefront at lambda 1, is diffracted. Patents.
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