Optical: systems and elements – Polarization without modulation – Depolarization
Patent
1995-01-19
1997-04-01
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
Depolarization
359497, 359498, 359499, 372105, 372106, G02B 530
Patent
active
056172460
ABSTRACT:
A polarized light coherent combining laser apparatus comprises a unit, which is constituted of a compensating phase difference plate, a polarized light separating element, and a phase difference plate. A phase difference and an angle of inclination of principal axes of the phase difference plate are set so as to satisfy specific conditions in accordance with the intensity ratio between two linearly polarized laser beams, which impinge upon the unit. The two linearly polarized laser beams, which have the directions of polarization orthogonal to each other and which impinge upon the unit, are combined with each other by the polarized light separating element. The combined laser beam is converted by the phase difference plate into a beam polarized linearly in a predetermined direction. The resulting beam passes through an analyzer, is reflected by a radiating mirror, and again impinges upon the unit. The laser beams having separated from each other in the unit are then reflected by mirror surfaces of laser beam sources. The laser beams are thus repeatedly reflected between the mirror surfaces of the laser beam sources and the radiating mirror and are thereby combined coherently.
REFERENCES:
patent: 4914664 (1990-04-01), Woodward
patent: 5062694 (1991-11-01), Bair
patent: 5091912 (1992-02-01), Bretenaker et al.
patent: 5107509 (1992-04-01), Esterowitz et al.
patent: 5164946 (1992-11-01), Negus et al.
Optics Letters, vol. 11, No. 5, May 1986 "Fabrication and Evaluation of Laminated Polarization Splitters Consisting of a-Si:H / SiO2 Multilayers" Tsuchida et al OQE 91-143, pp. 67-72.
Fuji Photo Film Co. , Ltd.
Shafer Ricky D.
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