Patent
1981-10-26
1983-11-22
Arnold, Bruce Y.
3501622, G02B 2717, G03H 120
Patent
active
044165056
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 processing. The swell is monitored during production by determining the shift in the angle of the Bragg surfaces within the gel. The angle of the replicating 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 proper angle after swelling in order to maximize the diffraction efficiency of the element at the original reference beam angle.
REFERENCES:
Lin et al., "Efficient and Aberration-Free Wavefront Reconstruction from Holograms Illuminated at Wavelengths Differing from the Forming Wavelength", Appl. Opt. 10, 1314, (1971).
Malin et al., "Wavelength Scaling Holographic Elements", Optical Engineering, Sep./Oct. 1981, vol. 20, No. 5, pp. 256-258.
George et al., "Holographic Diffraction Gratings", Applied Physics Ltrs., Sep. 1, 1966, pp. 212-215.
Arnold Bruce Y.
International Business Machines - Corporation
Woods Gerald R.
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