Electrooptic device for scanning using domain reversed regions

• US 5,317,446 A
• Filed: 09/29/1992
• Issued: 05/31/1994
• Est. Priority Date: 09/29/1992
• Status: Expired due to Fees

• Current Assignee: Accelight Investments Incorporated, Carnegie Mellon University
• Original Assignee: Eastman Kodak Company
• Inventors: Stancil, Daniel, Schlesinger, Tuviah E., Mir, Jose M.
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): LOPEZ, FRANK D
• Application Number:
  US07/953,460
• Time in Patent Office: 609 Days
• Field of Search: 359/290, 359/296, 359/298, 359/315
• US Class Current: 359/296
• CPC Class Codes: G02F 1/292 by controlled diffraction or phased-array beam steering controlled diffraction for optical switching G02F1/31

Abstract

A scanning device having: (i) an electrooptic planar waveguide or bulk material capable of propagating light beams with minimum beam distortion, (ii) an electrooptic prism array defined on said electrooptic planar waveguide or bulk material, comprised of at least one pair of antiparallel-poled ferroelectric domain regions and, (iii) control means to apply a spatially uniform electric field throughout said electrooptic prism array using a pair of electrically-addressable continuous electrodes, so as to induce an electrically-controlled deflection to a light beam propagating through the device.

Claims

1. An improved scanning device for deflecting an incident light beam through an electronically controlled angle in response to the application of an electric field to the device comprising:

a monolithic body including a light transmissive portion formed from electrooptic material;

at least first and second antiparallel poled ferroelectric regions in the light transmissive portion; and

electrode means on the body, said electrode means arranged on the body overlying the first and second antiparallel poled ferroelectric regions, so that upon the application of an electrical signal to the electrode means, an electric field is created at least partially within the light transmissive portion of the body, at least a part of each ferroelectric region being intersected by the electric field.

2. The scanning device of claim 1 in which the body is a planar body and the electrode means comprise at least a pair of electrodes one being disposed on each of two opposed surfaces of the body for creating an at least locally spatially constant electric field in the planar body, between the electrodes.

3. The scanning device of claim 2 in which said first and second antiparallel poled ferroelectric regions comprise a prism array disposed within said locally spatially constant electric field.

4. The scanning device of claim 1 also comprising means for coupling an input light beam into the light transmissive portion.

5. The scanning device of claim 1 in which said first and second antiparallel poled ferroelectric regions comprise a prism array of at least two triangular shaped regions.

6. The scanning device of claim 1 comprising means for coupling an output light beam out of the light transmissive portion.

7. The scanning device of claim 6 in which the pair of electrodes comprises a pair of continuous electrodes.

8. The scanning device of any of claims 1-7 in which the light transmissive portion comprises a thin film of electrooptic material characterized by a first index of refraction disposed on a material characterized by a second lower index of refraction.

9. The scanning device of claim 8 in which the thin film of electrooptic material has a thickness sufficient to allow the propagation of at least one low loss optical mode through the thin film.

10. The scanning device of claim 9 in which the thin film of electrooptic material comprises a layer of material including an impurity diffused into said layer.

11. The scanning device of claim 10 also comprising a layer of dielectric material between said electrode means and thin film of electrooptic material.

12. The scanning device of claim 11 in which said layer of dielectric material comprises a layer of material characterized by an index of refraction lower than the first index of refraction.

13. The scanning device of claim 9 in which the material characterized by a second lower index of refraction comprises a substrate and the thin film of electrooptic material comprises a layer of material deposited on the substrate.

14. The scanning device of claim 13 also comprising a layer of dielectric material between said electrode means and thin film of electrooptic material.

15. The scanning device of claim 14 in which said layer of dielectric material comprises a layer of material characterized by an index of refraction lower than the first index of refraction.

16. A scanning device for deflecting an incident light beam through an electronically controlled angle in response to the application of an electric field to the device comprising:

a monolithic body including a light transmissive portion formed from electrooptic material;

electric field generating means for creating an electric field within the light transmissive portion;

a first region in said light transmissive portion within said electric field, characterized by an index of refraction that increases in response to said electric field; and

a second region in said light transmissive portion within said electric field and adjacent to the first region, characterized by an index of refraction that decreases in response to said electric field;

whereby the application of a unipolar electric field to the device increases the angle through which a light beam is deflected while passing from the first region to the second region.