Polarizing optical element and device using the same

Details Polarizing optical element and device using the same Polarizing optical element and device using the same

1991-08-05

1992-10-13

Arnold, Bruce Y.

Optical: systems and elements

Polarization without modulation

Polarization by reflection or refraction

359566, 359569, 369109, 369110, G02B 518, G02B 530

Patent

active

051556227

ABSTRACT:
A polarizing optical element which comprises a first substrate having a first surface formed with first and second gratings so as to cross relative to each other at a predetermined crossing angle, each of which first and second gratings has a grating pitch equal to or smaller than the wavelength of a laser beam which may be incident upon the polarizing optical element. A magneto-optical head system of a type comprising a laser source for emitting and projecting a laser beam on a magneto-optical recording medium and utilizing a magneto-optical effect for reading information, recorded on the magneto-optical recording medium, by the utilization of reflected or transmitted laser beams reflected from or transmitted through the magneto-optical recording medium and utilizing the polarized optical element is also disclosed.

REFERENCES:
patent: 1717360 (1929-06-01), Anderson, Jr. et al.
patent: 3622220 (1971-11-01), Kogelnik
patent: 4448485 (1984-05-01), Bergman et al.
patent: 4800547 (1989-01-01), Kessels et al.
patent: 4846552 (1989-07-01), Veldkamp et al.
patent: 4856857 (1989-08-01), Takeuchi et al.
patent: 4885734 (1989-12-01), Yuzo
Herwig Kogelnik, "Coupled Wave Theory for Thick Hologram Gratings", The Bell System Technical Journal, vol. 48, No. 9, Nov. 1969, pp. 2909 to 2947.
Cowan et al., "Artificial Polarization Anomalies from Holographic Gratings", Optics Communications, vol. 21, No. 3, Jun. 1977, pp. 428-431.
Moharam et al., "Diffraction Characterics of Photoresist Surface-Relief Gratings", Applied Optics, vol. 23, No. 18, Sep. 15, 1984, pp. 3214-3220.

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