Light beam-splitter

Details Light beam-splitter Light beam-splitter

1983-12-13

1987-02-24

Henry, Jon W.

350171, 350401, G02B 2710, G02B 504

Patent

active

046453024

ABSTRACT:
To produce a plurality of parallel light beams from a single input beam, the input beam is incident on a partially transmissive face of a triangular prism, the other two faces of which are silvered. The input beam strikes the partially-transmissive face at such a position and at such an angle of incidence that it gives rise to only two parallel emitted beams, part of the emitted light arising from internal reflections at both silvered faces. A number of such prisms may be arranged in series so that the n.sup.th prism receives 2.sup.n-1 beams and emits only 2.sup.n parallel output beams.
The partially-transmissive face or faces may be coated to give rise to output beams of substantially equal intensity. In one form, each beam entering each prism has equal S- and P-polarization components.

REFERENCES:
patent: 3402364 (1968-09-01), De Lang
patent: 3982819 (1976-09-01), Letellier
patent: 4084883 (1978-04-01), Eastman et al.
patent: 4392722 (1983-07-01), Shirasaki

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