Ripple-free dichroic mirrors

Details Ripple-free dichroic mirrors Ripple-free dichroic mirrors

1975-07-23

1977-09-13

Henry, Jon W.

350171, G02B 528, G02B 2714

Patent

active

040478050

ABSTRACT:
A dichroic mirror is made up of alternating layers of a material having a high index of refraction and a material having a low index of refraction arranged in a stack on one surface of a substrate. The dichroic mirror is effective to separate light in the visible spectrum range, incident thereupon, into two components, one of which is transmitted and the other of which is reflected. Each of the first, second and last layers in the stack, counting outwardly from the substrate, is controlled to an optical thickness deviated from an odd number of quarter-wavelengths of a design wavelength in air, to effect a uniform distribution of transmittance coefficients over the transmitted components.

REFERENCES:
patent: 2338234 (1944-01-01), Dimmick
patent: 2422954 (1947-06-01), Dimmick
patent: 2624238 (1953-01-01), Widdop et al.
patent: 2890624 (1959-06-01), Widdop et al.
patent: 3697153 (1972-10-01), Zycha
patent: 3737210 (1973-06-01), Howe
patent: 3781090 (1973-12-01), Sumita
Gisin et al., "Optics & Spectkoscopy," vol. XIV, No. 3, Mar. 1963, pp. 210-212.

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