Wide-band half-mirror

Details Wide-band half-mirror Wide-band half-mirror

1991-08-12

1993-03-30

Arnold, Bruce Y.

Optical: systems and elements

Light interference

Produced by coating or lamina

359359, 359588, 359589, 359634, 359839, G02B 528, G02B 2714

Patent

active

051989301

ABSTRACT:
The operable wavelength band of a wide-band half-mirror is windened by inserting, between (1) a substrate having index of refraction n.sub.sub and (2) layers with indices of refraction (n.sub.H .multidot.n.sub.L).sup.2 of the known four-film type dielectric half mirror having a construction represented by n.sub.sub /(n.sub.H .multidot.n.sub.L).sup.2 /air; alternating layers of: (a) high refractive index dielectric substances n.sub.H1, n.sub.H2 . . . ; and (b) low refractive index dielectric substances n.sub.L1, n.sub.L2 . . . ; each film having a thickness of .lambda..sub.o /2. The alternating layers to be inserted have indices of refraction related as follows:

REFERENCES:
patent: 2700323 (1955-01-01), Schroder
patent: 3614188 (1971-10-01), Seeley et al.
patent: 4904083 (1990-02-01), Lu et al.
patent: 4931315 (1990-06-01), Mellor
patent: 4932754 (1990-06-01), Haisma et al.
patent: 4979802 (1990-12-01), Ichikawa
Jenkins, F. A. and White, H. E., Fundamenals of Optics, 3rd Edition, McGraw-Hill, New York 1957, chapter 25, pp. 509-534.

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