Polarization beam coupler including a splitter for producing an

Details Polarization beam coupler including a splitter for producing an Polarization beam coupler including a splitter for producing an

1989-11-03

1993-06-29

Arnold, Bruce Y.

Optical: systems and elements

Polarization without modulation

Polarizarion by dichroism

359495, 359497, 359122, 385 11, 385 36, G02B 530, G02B 2728

Patent

active

052239756

ABSTRACT:
A polarization beam coupler adapted to produce an output light beam for monitoring is disclosed. The polarization beam coupler includes a polarization beam coupling cube for coupling two incident light beams having polarization planes perpendicular to each other and projecting the coupled light beams on the same optic axis, a beam splitting cube having a beam splitting film formed from a dielectric multi-layer or single-layer film for extracting a monitor beam, and a quarter-wave plate interposed between the polarization beam coupling cube and the beam splitting cube such that incident light beams to the beam splitting cube may be circularly polarized light. Due to the construction, the output level of a monitor light beam can be prevented from depending upon the polarization planes of the incident light.

REFERENCES:
patent: 1304517 (1919-05-01), Twyman et al.
patent: 3584221 (1971-06-01), Furukawa
patent: 4272159 (1981-06-01), Matsumoto
patent: 4392722 (1983-07-01), Shirasaki
patent: 4671613 (1987-06-01), Buhrer
patent: 4800556 (1989-01-01), Charlier et al.
IBM Technical Disclosure Bulletin, vol. 15, No. 4, Sep. 1982, pp. 1399-1400; J. J. Wynne: "Light Beam Combiner", *Whole document*.
Patent Abstracts of Japan, vol. 9, No. 327 (P-415)[2050], Dec. 21, 1985; & JP-A-60 151 610, (Canon K. K.), Aug. 9, 1985.

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