Optical: systems and elements – Absorption filter
Patent
1983-07-29
1998-12-01
Moskowitz, Nelson
Optical: systems and elements
Absorption filter
359589, 359601, G02F 116
Patent
active
058447350
ABSTRACT:
An optical material having an index of refraction dependent on wavelength of incident radiation is used between the reflectors of an off-normal Fabry-Perot cavity used as an interference filter. External to the cavity, and in the direction of incident radiation, another optical material having an index of refraction dependent on wavelength of radiation is placed. The incident radiation is thus refracted into and within the cavity dependent on its wavelength. By proper choice of the indices of refraction, and other variables, the filter may be designed to exactly match the output spectrum of a line spectrum laser, and to transmit all spectral lines of the laser, but to reflect all other radiation of interest.
REFERENCES:
patent: 3358243 (1967-12-01), Collins et al.
patent: 3672746 (1972-06-01), Miller
patent: 3699347 (1972-10-01), Buchan et al.
patent: 3930718 (1976-01-01), Jensen
patent: 4204771 (1980-05-01), Shull
patent: 4448486 (1984-05-01), Evans
Grischwansky et al, "Double-Fabry-Perot Filter" Jan. 1972, p. 2500, IBM t. Disc Bull., vol. 14, #8.
Gustafsson et al, Wavelength Scanning . . . , Nov. 1979, pp. 1100-1102, J. Phys. B: Sci Instr., vol. 12, #11.
Frolich et al, "Tuning Properties . . . Fabry-Perot et al", Mar. 1976, pp. 205-207, Appl. Physi., vol. 9, #3.
Sharp Edward J.
Shurtz, II Richard R.
Dunn Aubrey J.
Edelberg Nathan
Lee Milton W.
Moskowitz Nelson
The United States of America as represented by the Secretary of
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