Method for making holographic optical elements with high...

Details Method for making holographic optical elements with high... Method for making holographic optical elements with high...

G - Physics

03

H

345/58, 88/0.14

G03H 1/20 (2006.01) G02B 26/10 (2006.01)

Patent

CA 1175265

RA981018 METHOD FOR MAKING HOLOGRAPHIC OPTICAL ELEMENTS WITH HIGH DIFFRACTION EFFICIENCIES Abstract Production quantities of a multi-element holographic scanner disc are made by optically replicating a silver halide master disc one element at a time in a dichromated gelatin film. The dichromated gelatin film swells during pro- cessing. The swell is monitored during production by determining the shift in the angle of the Bragg surfaces within the gel. The angle of the repli- cating beam for each element is changed from that of the original reference beam to establish a Bragg angle at exposure which will be tilted to the pro- per angle after swelling in order to maximize the diffraction efficiency of the element at the original reference beam angle.

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