Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1992-05-12
1993-09-07
Look, Edward K.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359634, 359350, G02B 2714
Patent
active
052434656
ABSTRACT:
A broadband area-division beamsplitter that includes a pair of abutting triangular prisms providing two surfaces that are in optical contact in certain areas and are out of optical contact in other areas. One prism surface is substantially planar while adjoining surface of the other prism has alternating protrusions and depressions. The protrusions contact the substantially planar surface to form an optically continuous medium for light transmission. The depressions do not contact the planar surface forming gaps. The two surfaces are oriented on a diagonal so that light incident through one of the other prism faces is incident on the adjoining surfaces at an angle larger than the critical angle, providing total internal reflection at the out-of-contact gap regions. The protrusions and depressions on the one prism surface may be in the form of a corrugation or a checkerboard or some other patterns. The reticulation size of the pattern may be less than about 10 .mu.m , so that light diffracted from the beamsplitter will fall outside of the apertures of optical systems in which the beamsplitter is used.
REFERENCES:
patent: 1509936 (1924-09-01), Douglass
patent: 3436143 (1969-04-01), Garrett
patent: 4555163 (1985-11-01), Wagner
patent: 4586786 (1986-05-01), Suzuki et al.
patent: 4844617 (1989-07-01), Kelderman et al.
patent: 5099358 (1992-03-01), Okazaki
Oriel Corporation "Polka Dot Beam Splitters", pp. 7-8 of catalog.
Oriel Corporation "Coarse Grating Beam Splitters", pp. 7-12 of catalog.
Look Edward K.
Lopez F. David
Tencor Instruments
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