Three color dichroic beamsplitter for separating or combining un

Details Three color dichroic beamsplitter for separating or combining un Three color dichroic beamsplitter for separating or combining un

1997-02-26

1999-03-09

Ben, Loha

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359629, 359583, G02B 2714

Patent

active

058808892

ABSTRACT:
A beamsplitter (70) for separating a beam of light (48, 90, 92) into three frequency bands (94, 96, 98) corresponding to a first color (94), a second color (98), and a third color (96) adapted for use with a beam of white light (92). The inventive beamsplitter (70) includes first (78) and second (80) surfaces for reflecting the first color of light (94) and for transmitting the second color of light (98). A third (82) and fourth (84) surface reflect the second color of light (96) and transmit the third color of light (98). A glass support structure (72) supports the first (78), second (80), third (82), and fourth (84) surfaces in a predetermined configuration. The configuration is chosen so that the first color of light (94) is directed in a first direction (94), the second color of light (96) is directed in a second direction (96), and the third color of light (96) is directed in a third direction (96). The support structure (72) includes a first material having a second index of refraction that is sufficiently different than the index of refraction of a surrounding material (86) to minimize undesirable polarization effects. In the illustrative embodiment, the surrounding material (86) is air.

REFERENCES:
patent: 5165079 (1992-11-01), Schulz-Henning
patent: 5221998 (1993-06-01), Sugahara
patent: 5241407 (1993-08-01), Sonehara et al.
patent: 5245472 (1993-09-01), Hegg

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