Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-02-16
1995-04-18
Look, Edward K.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359484, 359495, 359497, G02F 109, G02B 2728, G02B 530
Patent
active
054083540
ABSTRACT:
An optical isolator according to the invention comprises a first birefringent element for separating an incident light beam into two light beams that are vertical to each other in the polarization direction and are not parallel with each other in the propagation direction, a 45.degree. Faraday rotator, a second birefringent element that is identical with the first birefringent element in terms of the light beam-separation angle but is different by 45.degree. from the first polarizer in terms of the angle the separated two light beams make to the polarization of the beams, and at least one birefringent crystal plane plate that has a function capable of converging two parallel light beams, with the planes of polarization at right angles with each other, into a single beam.
REFERENCES:
patent: 4239329 (1980-12-01), Matsumoto
patent: 4375910 (1983-03-01), Seki
patent: 4712880 (1987-12-01), Shirasaki
patent: 5029988 (1991-07-01), Urino
patent: 5033828 (1991-07-01), Haruta
patent: 5052786 (1991-10-01), Schulz
patent: 5267078 (1993-11-01), Shiraishi et al.
Chichibu Cement Co. Ltd.
Lee Michael S.
Look Edward K.
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