Thin-film color-selective beam splitter and method of fabricatin

Details Thin-film color-selective beam splitter and method of fabricatin Thin-film color-selective beam splitter and method of fabricatin

1996-07-17

1998-07-28

Nelms, Daivd C.

Optical: systems and elements

Light interference

Produced by coating or lamina

359586, 359587, 359588, 359589, 359638, 359834, G02B 110, G02B 528, G02B 2714, B05D 136

Patent

active

057869375

ABSTRACT:
A thin-film color-selective beam splitter and the method of fabricating the same are disclosed. The method includes the steps of: (i) forming a main prism by a pre-selected material, and deciding a first base angle and a second base angle according to the substance and coating characteristics of the pre-selected material; (ii) coating a first multilayer film and a second multilayer film on two slopes of the main prism, in which tilt angles for coating the first multilayer film and the second multilayer film and tilt angles of light entering and emerging the main prism are different, so that spectra of the first multilayer film and the second multilayer film are different, and the first multilayer film can be a red reflective film and the second multilayer film can be a blue reflective film; and (iii) using the pre-selected material to form interface prisms, and adhering the interface prisms to the main prism, so that light can perpendicularly enter and emerge from surfaces of the prism. Moreover, the method may include a further step of: coating a filtering film on an emerging interface of the main prism for green light. A thin-film color-selective beam splitter can be formed by the above method with a single coating process and can serve as a tri-color beam splitter.

REFERENCES:
patent: 2189932 (1940-02-01), Ball et al.
patent: 4171869 (1979-10-01), Higuchi et al.
patent: 4507679 (1985-03-01), Bendell
patent: 5339158 (1994-08-01), Akiyama et al.

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