Polarization detector

Details Polarization detector Polarization detector

1993-07-21

1995-12-05

Lerner, Martin

Optical: systems and elements

Polarization without modulation

Polarization by reflection or refraction

359566, 359569, 369109, 369110, G02B 518, G02B 530, G02B 2728, G11B 700

Patent

active

054734703

ABSTRACT:
A polarization detector includes a polarization diffraction element having a substrate with two facing surfaces which are placed in parallel with each other, a first diffraction grating formed on one surface of the substrate, and a second diffraction grating formed on the other surface of the substrate, with light being incident upon the first diffraction grating. Further, each grating pitch of the first diffraction grating and the second diffraction grating are nearly equal to a wavelength of the incident light. A limiting member is also included for limiting an incident region of the incident light with respect to the polarization diffraction element. The limiting member is formed on a light incident side of the first diffraction grating. Further, a converging lens is included for respectively converging light transmitted through the first diffraction grating and the second diffraction grating and light diffracted by the first diffraction grating and the second diffraction grating into different beam spots. Finally, a pair of photodetectors are included for detecting each optical intensity of the two beam spots converged by the converging lens.

REFERENCES:
patent: 4547664 (1985-10-01), Vogt et al.
patent: 5013107 (1991-05-01), Biles
patent: 5029154 (1991-07-01), Sumi et al.
patent: 5085496 (1992-02-01), Yoshida et al.
patent: 5101389 (1992-03-01), Ohuchida et al.
patent: 5272550 (1993-12-01), Dickson et al.
"Dielectric Surface-Relief Gratings with High Diffraction Efficiency" by K. Yokomori, Applied Optics, vol. 23, #14, pp. 2303-2310, Jul. 15, 1984.
"Dielectric Surface-Relief Gratings with High Diffraction Efficiency" by K. Yokomori, Ricoh Tech. Report, #12, pp. 21-26, Dec. 1984 (English translation with Japanese Abstract thereof).

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