Illumination device
AssigneeSeeReal Technologies S.A.
InventorGerald FUTTERER
Life of this patent
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Abstract
The invention refers to an Illumination device for illuminating a spatial light modulator device. Sub-holograms are used for encoding a hologram into the spatial light modulator device. The Illumination device comprises at least one light source for emitting light for illuminating the spatial light modulator device and a beam shaping unit. The beam shaping unit provides a flat-top plateau-type distribution of an absolute value of a complex degree of mutual coherence of the light in a plane of the spatial light modulator device to be illuminated. The flat-top plateau-type distribution of the absolute value of the complex degree of mutual coherence has a shape that is at least similar to a shape of the largest sub-hologram used for encoding of object points into the spatial light modulator device.
Claims28
An illumination device for illuminating a spatial light modulator device, where sub-holograms are used for encoding a hologram, comprising:
- At least one light source for emitting light for illuminating the spatial light modulator device,
- A beam shaping unit providing a flat-top plateau-type distribution of an absolute value of a complex degree of mutual coherence of the light in a plane of the spatial light modulator device to be illuminated, where the flat-top plateau-type distribution of the absolute value of the complex degree of mutual coherence has a shape that is at least similar to a shape of the largest sub-hologram used for encoding of object points into the spatial light modulator device.
A method for illuminating a spatial light modulator device with a light intensity distribution having defined coherence properties, where sub-holograms are used for encoding a hologram in the spatial light modulator device, comprising the following steps:
- Emitting light by at least one extended light source,
- Collimating the light propagating behind the at least one extended light source by a collimation unit,
- Generating a flat-top plateau-type distribution of an absolute value of a complex degree of mutual coherence of the light in a plane of the spatial light modulator device by a beam shaping unit, where the flat-top plateau-type distribution of the absolute value of the complex degree of mutual coherence has a shape that is at least similar to a shape of the largest sub-hologram used for encoding of object points in the spatial light modulator device, and
- Illuminating the spatial light modulator device with the flat-top plateau-type distribution of the absolute value of the complex degree of mutual coherence of the light.
Dependencies are inferred from the claim text.