Patent
1979-10-05
1982-01-05
Corbin, John K.
G02B 110
Patent
active
043090753
ABSTRACT:
A high reflectance mirror utilizing a dielectric stack having multiple layers of low and high refractive index material, at least one of which is absorbing at the design wavelength. At least one pair of layers is formed on a substructure with the thickness of the individual layers being both different from a quarterwave optical thickness and preselected to maximize the reflectance of the mirror. Mirrors in which both dielectric materials in the stack have different absorptances at the design wavelength are disclosed with the layer thickness of one or more optimum pairs formed on a substructure being different from a quarterwave optical thickness such that the layers of higher absorptance material are less than a quarterwave optical thickness and the layers of lower absorptance material are more than a quarterwave optical thickness. The individual thicknesses of the layers are optimized to provide maximum reflectance, leading to a non-periodic stack when a substantial number of such optimum pairs of layers are utilized.
REFERENCES:
patent: 3887261 (1975-06-01), Spiller
Koppelmann, Von G., "Zur Theorie der Wechselschichten aus schwachabsorbierenden Substanzen und ihre Verwendung als Interferometerspiegal," Annalen der Physik, 7 Folge., Band 5, pp. 388-396, 1960.
Sparks, M. and Flannery, M., "Simplified Description of Multilayer Dielectric Reflectors,". J. Opt. Soc. Am., vol. 69, No. 7, Jul. l979.
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DeBell, Gary W., "The Design and Measurement of Low Absorptance Optical Interference Coatings," Ph.D. Thesis, The Institute of _Optics, The University of Rochester, Rochester, N.Y., 1972.
Apfel, Joseph H., "Optical Coating Design with Reduced Electric Field Intensity," Applied Optics, vol. 16, p. 1880, Jul. 1977.
Spiller, E., "Low-Loss Reflection Coatings Using Absorbing Materials," Appl. Phys. Lett., vol. 20, p. 365 (1972).
Spiller, E., "Multilayer Interference Coatings for the Vacuum Ultraviolet," Space Optics, ISBN 0-309-02144-8, National Academy of Sciences, Washington, D.C., 1974.
Spiller, E., "High Quality Fabry-Perot Mirrors for the Ultraviolet," Optik, vol. 39, (No. 2), 118-125, (1973).
Spiller, E., "Reflective Multilayer Coatings for the Far UV Region," Applied Optics, vol. 15, No. 10, 2333, Oct. 1976.
Apfel Joseph H.
Carniglia Charles K.
Arnold Bruce Y.
Corbin John K.
Optical Coating Laboratory, Inc.
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