Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1984-08-23
1986-06-17
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
350407, 351 49, G02B 530, G02C 712
Patent
active
045952620
ABSTRACT:
A set of safety goggles (20) for adjustably attenuating the intensity of optical radiation at any selected wavelength produced by a variable-wavelength laser (e.g., a dye laser) comprises a pair of oculars, both of which can be tuned to any particular wavelength producible by the laser. Each ocular comprises a birefringent filter, which includes stationary components including a polarizer (11), a wide-field element made up of a half-wave plate (13) sandwiched between multiwave plates (12 and 14), and a quarter-wave plate (16), and rotatable components including a polarizer (18). The wide-field element causes an optical path difference between orthogonal components of a single polarization state. The quarter-wave plate (15) and the rotatable polarizer (18) in combination enable selection of any particular wavelength whose intensity is to be attenuated. Both oculars are coupled so that rotation of the polarizer (18) of one ocular through a selected angle results in simultaneous rotation of the polarizer (18) of the other ocular through the same angle.
REFERENCES:
patent: 3368652 (1968-02-01), Klatchlto
patent: 3944346 (1976-03-01), Shindler
patent: 4201450 (1980-05-01), Trapani
Title et al, Tunable Birefringent Filter, Optical Engineering, vol. 20, No. 6, 11-1981, pp. 815-823.
Corbin John K.
Lockheed Missiles & Space Company Inc.
Morrissey John J.
Shapiro B. S.
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