Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1984-08-13
1988-11-22
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
350 37, 35016217, 351 44, G02B 518, G02B 532, G02C 710, G03H 102
Patent
active
047861258
ABSTRACT:
A laser shield (FIG. 3) for providing ocular protection against laser hazards, while still providing high photopic or scotopic transmittance and good color discrimination is disclosed. This laser shield comprises a holographic optical notch filter mirror (102) having an optical surface such that the angle (104) made by an incoming laser beam (114), which is aimed by the pupil of the user, with respect to the normal of the optical surface is less than the corresponding angle (108) made by the same incoming laser beam (114) with respect to the physical surface of the substrate. This decrease in the effective angle of incidence reduces the spectral shift of the notch (which defines the frequency that is reflected), thereby providing increased protection for the same range of angles of incidence. The holographic mirror optical surface formed can be the analog of a conventional spherical, hyperbolic, parabolic, elliptical or other aspheric mirror.
REFERENCES:
patent: 3519339 (1970-07-01), Hutchinson et al.
patent: 4601533 (1986-07-01), Moss
patent: 4637678 (1987-01-01), Moss et al.
Hayford, Michael J., "Holographic Optical Elements," Photonics Spectra, vol. 16, #4, Apr. 1982, pp. 77-80.
Rao, S. A., et al, "Holographic Methods for the Fabrication of Various Types of Mirrors," Rev. Sci. Instrum. 51(6), Jun. 1980, pp. 809-813.
Johnson, K. C., et al, "Laser Eye Protection," Final Report for 8/7 7-6/79 on Contract N62269-77-R-0307, Naval Air Systems Command, 7/79 (Govt Accession #AD-A112305).
Coleman Daniel
Magarinos Jose
Corbin John K.
Edmondson David J.
Farrand Optical Co.
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