Method and apparatus for modulating unpolarized light
AssigneeHeidelberger Druckmaschinen AG
InventorsJoerg-Achim Fischer, Axel Gebhardt, Peter Ressel
Life of this patent
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Abstract
The method and apparatus for amplitude modulation of unpolarized light by at least one Bragg modulator on the basis of domain-invertible material, the unpolarized light is modulated by a first Bragg modulator both for defining a polarization plane in the unpolarized light and for modulating a light part to be allocated to the polarization plane. A second Bragg modulator is provided which modulates the light part of the unpolarized light allocated to the polarization plane orthogonal to the polarization plane of the first Bragg modulator. The method and apparatus are particularly useful for recording a product to be printed, such as for manufacturing printing forms.
Claims18
A method for modulating of light traveling along a light path on the basis of domain-invertible material to record a product to be printed, comprising the steps of:
- defining a first polarization plane in the unpolarized light by modulating the unpolarized light with a first Bragg modulator based on said domain-invertible material therein, and for modulating a light part of the unpolarized light to be allocated to the first polarization plane;
- and
- using a second Bragg modulator based on said domain-invertible material therein to modulate a light part of the unpolarized light allocated to a second polarization plane, said second polarization plane being orthogonal to said first polarization plane.
An apparatus for modulating light traveling along a light path on the basis of domain-invertible material, comprising:
- a first Bragg modulator based on said domain-invertible material that defines a first polarization plane in an unpolarized light and modulates a light part to be allocated to said first polarization plane;
- and
- a second Bragg modulator based on said domain-invertible material that modulates the light part of a unpolarized light to be allocated to a second polarization plane orthogonal to said first polarization plane, the light thus being modulated for recording a product to be printed.
A method for modulation of light on the basis of domain-invertible material, comprising the steps of:
- modulating unpolarized light by use of a first Bragg modulator based on said domain-invertible material for defining a first polarization plane in the unpolarized light and for modulating a light part to be allocated to said first polarization plane;
- and
- modulating with a second Bragg modulator based on said domain-invertible material a light part of the unpolarized light that is allocated to a second polarization plane orthogonal to the first polarization plane of the first Bragg modulator.
A device for modulation of light on the basis of domain-invertible material, comprising:
- a first Bragg modulator based on said domain-invertible material for defining a first polarization plane in an unpolarized light and for modulating a light part to be allocated to said first polarization plane;
- and
- a second Bragg modulator based on said domain-invertible material for modulating a light part of the unpolarized light allocated to a second polarization plane orthogonal to the first polarization plane of the first Bragg modulator.
Dependencies are inferred from the claim text.