Method and device for attenuating light as a function of...

Optical: systems and elements – Optical modulator – Light wave temporal modulation

Reexamination Certificate

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Details

C359S279000, C359S237000

Reexamination Certificate

active

07050213

ABSTRACT:
An intensity-dependent light modulating device involves a light successively passing through a polarizer, a first phase retardation plate and a first light modulator. The light then strikes a mirror and passes one again through the light modulator and the phase retardation plate in the opposite direction. The light then strikes an analyzer that is crossed relative to the polarizer. The light modulator and the phase retardation plate are respectively located in an electric field in which the indicatrices of the light modulator and the phase retardation plate are deflected, the deflection of the indicatrix of the light modulator being intensity-dependent. Due to the passage of light through the phase retardation plate and the light modulator, an intensity-dependent rotation of the direction of polarization occurs in such a way that higher intensity light is filtered in the analyzer while lower intensity light is transmitted.

REFERENCES:
patent: 6137636 (2000-10-01), Smith
patent: 6366402 (2002-04-01), Li
patent: 196 16 323 (1997-10-01), None
patent: 197 31 135 (1999-02-01), None
patent: 0 997 767 (2000-05-01), None
patent: WO 00 36462 (2000-06-01), None

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