Optical: systems and elements – Light interference – Produced by coating or lamina
Patent
1993-06-01
1995-04-25
Lerner, Martin
Optical: systems and elements
Light interference
Produced by coating or lamina
359588, 359589, G02B 528
Patent
active
054104319
ABSTRACT:
A multiple pass band, thin film optical filter includes a first single pass band filter having a first pass band at a first wavelength, with a first quarterwave stack of thin film layers alternating between layers of a first dielectric material having a first refractive index and layers of a second dielectric material having a second refractive index, the optical thickness of each layer in the first stack being substantially one fourth of the first wavelength. A first half wave layer is interposed within the first stack and has an optical thickness which is an integral multiple of one half of the first wavelength, such that the reflectivities of the portions of the first stack on either side of the first half wave layer are substantially identical. A second single pass band filter having a second pass band at a second wavelength, includes a second quarterwave stack of thin film layers alternating between layers of the first dielectric material and layers of the second dielectric material, the optical thickness of each layer in the second stack being substantially one fourth of the second wavelength, and a second half wave layer interposed within the second stack having a thickness which is an integral multiple of one half of the second wavelength, such that the reflectivities of the portions of the second stack on either side of the second half wave layer are substantially identical. The first and second single pass band filters are combined in series to provide a filter with a pass band at the first wavelength and a pass band at the second wavelength.
REFERENCES:
patent: 3279317 (1966-10-01), Ploke
patent: 3423147 (1969-01-01), Thelen
patent: 3504959 (1970-04-01), Hennessey
patent: 3519339 (1970-07-01), Hutchinson et al.
patent: 3551017 (1970-12-01), Iwasaki et al.
patent: 4756602 (1988-07-01), Southwell
patent: 4826267 (1989-05-01), Hall
patent: 4952025 (1990-08-01), Gunning
patent: 5049780 (1991-09-01), Dobrowolski et al.
patent: 5138219 (1992-08-01), Krisl et al.
patent: 5179468 (1993-01-01), Gaslow
patent: 5181143 (1993-01-01), Southwell
patent: 5274661 (1993-12-01), von Gunten et al.
Macleod, Thin-Film Optical Filters, pp. 170, 194, & 238 (Macmillan 2d ec 1986).
Turner, et al., Multilayer mirrors with reflectance over an extended spectral region, Journal of Applied Optics, vol. 5, pp. 69-76 (1966).
Deinken John J.
Lerner Martin
Rockwell International Corporation
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