Polarizing beam splitter using dielectric multilayers

Details Polarizing beam splitter using dielectric multilayers Polarizing beam splitter using dielectric multilayers

1988-03-16

1990-11-27

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 360114, 350370, 350381, G11B 712, G11B 7135

Patent

active

049742191

ABSTRACT:
An optical analyzer for determining changes of the polarization plane in a light beam (4) comprises a substrate (20) supporting a photodetector array (21) and a system of imaging mirrors (22-24) underneath a parallel plate (25) of high-quality optical glass. The lower surface of the glass plate is covered by a system (26) of dielectric multilayers which acts as a polarizing beam splitter over a large range of angles of incidence. The optical beam (4) enters the analyzer through the glass plate to impinge under an oblique angle of incidence on a first mirror (24) which rotates the plane of polarization in the beam by 45 degrees with respect to the polarizing beam splitter, which then generates two beams partial (202,203) to be eventually directed to photodetector array (21). The beam analyzer is used in magneto-optical storage system to extract an information signal and to generate servo control signals for the focus and track positions of the beam. The tilted first mirror may have circular or stripe geometry and be integrally formed within the substrate (20). The multilayer polarizing beam-splitter system comprises two stacks of layers separated by an intermediate layer and covered by a thick dielectric layer.

REFERENCES:
patent: 3597047 (1971-08-01), Carbrey
patent: 4239337 (1980-12-01), Campbell et al.
patent: 4252410 (1981-02-01), Jain
patent: 4507766 (1985-03-01), Saimi et al.
patent: 4841510 (1989-06-01), Yoshizawa
IBM Technical Disclosure Bulletin, "Method for Reading Magneto-Optical Storage Media", vol. 29, No. 4, Sep. 1986, pp. 1871-1872.

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