Optical repolarizing devices

Details Optical repolarizing devices Optical repolarizing devices

G - Physics

02

B

G02B 27/28 (2006.01) G02B 5/30 (2006.01) G02B 6/126 (2006.01) G02B 6/34 (2006.01) G02B 27/10 (2006.01) G02B 6/12 (2006.01)

Patent

CA 2419304

An optical repolarizing device for transforming either a randomly polarized or unpolarized input beam into a polarized output beam. A polarization dependent beam splitter splits both polarization components of the incident signal and inserts them into an interferometer. In one arm of the interferometer, a polarization rotator, equivalent to a half waveplate, is inserted. In the other arm of the interferometer, a phase shifter is inserted. The phase shifter ensures that there are no delays between the signals in the two interferometer arms, and thus there is constructive interference when the two beams, now having the same polarization, recombine at the output of the interferometer, where a beam combiner is provided for this purpose. For unpolarized input light, the phase shifter is unnecessary.

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