Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1997-02-26
1998-10-27
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359583, G02B 2714, G02B 0110
Patent
active
058284974
ABSTRACT:
A system (50) for separating and combining frequency bands (64, 74, 78) from a beam (62) of electromagnetic energy adapted for use with a beam of white light (62) having a first (64), second (74) and third (78) frequency band. The inventive system (50) includes a first surface (58) for transmitting the first frequency band (64) and reflecting the second (70, 78) and third (70, 74) frequency bands. A second surface (60) reflects the second frequency band (74) and transmits the third (78) frequency band. A transparent support structure (52, 54, 56) supports the first surface (58) and the second surface (60) in a pre-determined orientation that provides for a low angle of incidence (66, 72) of electromagnetic energy impinging on the first surface (58) and the second surface (60) to minimize undesirable polarization effects. In a specific embodiment, the angle (66, 72) is 22.5 degrees. The predetermined orientation includes the first surface (58) angled with respect to the second surface (60) so that the first (64), second (74), and third (78) frequency bands have first (64), second (74), and third (78) separate paths respectively. In the illustrative embodiment, the support structure (52, 54, 56) includes a glass pentaprism (52). The first surface (58) has a dichroic coating on a first lateral surface (58) of the pentaprism (52) and the second surface (60) has a dichroic coating on the other lateral surface (60). The support structure (52, 54, 56) further includes a first (54) and second (56) glass surface attachment attached to the first (58) and second (60) surface respectively.
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Neumann Margarete
Pursel Robert
Epps Georgia Y.
Lenzen, Jr. G. H.
Mack Ricky
Raytheon Company
Schubert W. C.
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