Optically powered electro-optical component
View Patent ↗An optically powered optical modulator comprises an optical modulation component, such as an electro-optical modulator, acousto-optic modulator or magneto-optic modulator, in combination with one or two lens assemblies positioned at one or both apertures of the optical modulation component, so that the optical modulator formed by the combination of the lens assembly or assemblies and the optical modulation component has optical focus power.
1. An optically powered electro-optical modulator, comprising:
an electro-optical cell, the electro-optical cell comprising:
at least one electro-optical element having an optical axis and first and second opposed optically clear cell apertures defined by the optical axis;
at least one pair of opposed electrodes positioned to pass an electric field through the at least one electro-optical element to control modulation of incoming light aligned with the optical axis;
at least one optically powered lens assembly;
the at least one optically powered lens assembly comprising an optically powered first lens assembly secured at the first cell aperture;
the first lens assembly having an optically clear first lens aperture in optical alignment with the first cell aperture; and
a housing carrying the electro-optical cell, the electrodes and the at least one lens assembly;
wherein the at least one lens assembly causes the electro-optical modulator to act as a field lens for incoming light whose image region is within the electro-optical modulator.
2. The electro-optical modulator of claim 1 , wherein:
the at least one electro-optical element comprises at least one anisotropic, birefringent electro-optical crystal whose crystal axes define the optical axis; and
the electrodes are positioned to pass an electric field through the at least one crystal to control an amount of birefringence of the at least one crystal for incoming light aligned with the optical axis and thereby control polarization of the light.
3. The electro-optical modulator of claim 2 , wherein the electro-optical cell is a Pockels cell.
4. The electro-optical modulator of claim 2 , wherein the at least one pair of opposed electrodes are positioned so that the electric field passes through the at least one electro-optical element transversely to the optical axis.
5. The electro-optical modulator of claim 2 , wherein the at least one pair of opposed electrodes are positioned so that the electric field passes through the at least one electro-optical element longitudinally along the optical axis.
6. The electro-optical modulator of claim 1 , wherein the first lens assembly comprises a single lens.
7. The electro-optical modulator of claim 1 , wherein the first lens assembly comprises a plurality of individual lenses secured in optical alignment with one another.
8. The electro-optical modulator of claim 1 , wherein the at least one optically powered lens assembly further comprises:
an optically powered second lens assembly secured at the second cell aperture;
the second lens assembly having an optically clear second lens aperture in optical alignment with the second cell aperture and with the first lens aperture.
9. The electro-optical modulator of claim 8 , wherein the first lens assembly and the second lens assembly each comprise a single lens.
10. The electro-optical modulator of claim 8 , wherein the first lens assembly and the second lens assembly each comprise a plurality of individual lenses secured in optical alignment with one another.
11. The electro-optical modulator of claim 8 , wherein the first lens assembly comprises a single lens and the second lens assembly comprises a plurality of individual lenses secured in optical alignment with one another.
12. The electro-optical modulator of claim 1 , further comprising an electrical control system electrically coupled to the electrodes for controlling a voltage across the electrodes.
13. The electro-optical modulator of claim 1 , wherein the electro-optical cell is a Kerr cell.