Optical: systems and elements – Polarization without modulation – Polarization by reflection or refraction
Patent
1991-06-12
1993-10-26
Arnold, Bruce Y.
Optical: systems and elements
Polarization without modulation
Polarization by reflection or refraction
359558, 359569, 369109, 369110, 250237G, G02B 518, G02B 530, G11B 712
Patent
active
052571319
ABSTRACT:
A polarization diffraction element comprising two diffraction gratings formed on both faces of a substrate respectively. Both the diffraction gratings have grating lines which are arranged at the same grating pitch, and whose directions mutually form a predetermined minute angle. The grating lines may also be arranged parallel to each other. In this case, the relationship between grating pitches D.sub.1, D.sub.2 of the respective diffraction gratings and the wavelength .lambda. of an incident light is expressed as:
REFERENCES:
patent: 4800547 (1989-01-01), Kessels et al.
patent: 4993789 (1991-02-01), Biles et al.
patent: 5029154 (1991-07-01), Sumi et al.
patent: 5085496 (1992-02-01), Yoshida et al.
Yokomori, K. "Dielectric surface-relief gratings with high diffraction efficiency" Jul. 15, 1984/ vol. 23, No. 14/ Applied Optics pp. 2302-2310.
Maeda, H. et al. "A High Density Dual Type Grating for Magneto-Optical Disc Head" Japanese Journal of Applied Physics, vol. 28 (1989) Supplement 28-3, pp. 193-195.
Kurata Yukio
Miyake Takahiro
Nakata Yasuo
Yoshida Yoshio
Arnold Bruce Y.
Parsons David R.
Sharp Kabushiki Kaisha
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