Polarization detector and method for fabricating the polarization detector
AssigneeOSRAM Opto Semiconductors GmbH
InventorsWerner Späth, Ulrich Steegmüller
Life of this patent
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Abstract
A polarization detector is described which contains a beam splitter, which disperses an incident light beam into partial beam paths. The partial beams pass though λ/4 wafers and a cholesterol layer and impinge upon detectors. The polarization direction of the incident light beam can be measured by the polarization detector with the aid of the signal level of the detectors.
Claims13
A device for detecting a change of a polarization direction of linearly polarized light, comprising:
- a beam splitter for splitting incident linearly polarized light into partial beams;
- and
- filters and detectors disposed downstream of said beam splitter in a path of the partial beams, said filters each having a first layer of a bi-refringent material for converting the incident linearly polarized light into elliptically polarized light, and a second layer of a cholesterol-phase material disposed behind said first layer in an incident direction, said filters differ with respect to a dependency of a transmission on the polarization direction of the incident linearly polarized light.
A method for fabricating a device for detecting a polarization direction of linearly polarized light, which comprises the steps of:
- providing a substrate;
- forming detectors on the substrate;
- forming filters by depositing a cholesterol phase on a transparent carrier;
- attaching the carrier to the substrate;
- and
- disposing the filters and a beam splitter in front of the detectors in a direction of an optical path.
A method for fabricating a device for detecting a polarization direction of linearly polarized light, which comprises the steps of:
- providing a substrate;
- constructing detectors on the substrate;
- depositing a material of a cholesterol-phase layer on the substrate;
- and
- disposing filters and a beam splitter in a direction of an optical path in front of the detectors.
Dependencies are inferred from the claim text.