Methods, systems, and devices for steering optical beams

• US 20060061893A1
• Filed: 07/18/2005
• Published: 03/23/2006
• Est. Priority Date: 07/16/2004
• Status: Active Grant

• Current Assignee: Ohio State University
• Original Assignee: Ohio State University
• Inventors: Anderson, Betty Lise, Argueta-Diaz, Victor, Warnky, Carolyn
• Granted Patent: US 7,633,670 B2
• Time in Patent Office: Days
• US Class Current: 359/850
• CPC Class Codes: G02B 19/0023 at least one surface having optical power
• CPC Class Codes: G02B 19/0033 characterised by the use
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B

Abstract

Devices and methods are provided for steering optical beams. The devices use arrays and at least one optical element to steer an input beam to a desired location. Additionally, devices and methods are provided for changing the array dimensions of arrays of input beam positions. The devices use arrays and a plurality of optical elements to rearrange an input array.

Claims

1. A device for steering an optical beam, comprising:

an array of array elements;

at least one trap door in the array of array elements; and

at least one optical element, wherein at least one of the array elements in the array comprises an input array element that is arranged such that an input beam incident on the at least one input array element travels a light path from the input array element to the at least one optical element, and wherein the array of array elements and the at least one optical element are arranged such that the input beam subsequently travels between the array of array elements and the at least one optical element until the input beam is incident on the at least one trap door in the array of array elements.

2. The device as claimed in claim 1 wherein the at least one optical element is selected from a spherical mirror and a roof prism.

3. The device as claimed in claim 1 wherein the at least one input array element comprises an array element that is capable of tilting.

4. The device as claimed in claim 1 wherein the array comprises an array of mirrors capable of tilting.

5. The device as claimed in claim 1 wherein the at least one trap door is selected from one of a detector and an aperture.

6. The device as claimed in claim 1 further comprising an input lens arranged such that an input beam forms a point on the focal plane of the input lens prior to the input beam being incident on the at least one input array element.

7. The device as claimed in claim 1 wherein:

the array of array elements comprises a row of array elements;

the row of array elements has a trap door in the row, and wherein the at least one optical element comprises first and second optical elements; and

the row of array elements and the first and second optical elements are arranged such that the input beam travels between the row of array elements and the first and second optical elements until the input beam is incident on the trap door.

8. The device as claimed in claim 1 wherein:

the at least one optical element comprises first and second optical elements;

the array of array elements comprises more than one row of array elements and more than one column of array elements;

one of the columns of array elements comprises trap doors;

one of columns of array elements comprise input array elements arranged such that an input beam incident on one of the input array elements travels to one of the first and second optical elements; and

the array of array elements and the first and second optical elements are arranged such that the input beam subsequently travels between one of the rows of array elements and the first and second optical elements until the input beam is incident on one of the trap doors in the column of array elements comprising trap doors.

9. The device as claimed in claim 1 further comprising third and fourth optical elements, wherein:

the at least one optical element comprises first, second, third, and fourth optical elements;

the array of array elements comprises more than one row of array elements and more than one column of array elements;

at least one of the columns of array elements comprise input array elements arranged such that an input beam incident on one of the input array elements travels to one of the first and second optical elements; and

one of the columns of elements comprises switching array elements that are variably operable such that an input beam incident on one of the switching array elements travels to one of the third and fourth optical elements;

one of the switching array elements comprises a trap door;

the array of array elements and the first and second optical elements are arranged such that the input beam incident on one of the input array elements subsequently travels between one of the rows of array elements and the first and second optical elements until the input beam is incident on one of the switching array elements; and

the input beam incident on one of the switching array elements travels to one of the third or fourth optical elements and subsequently between the column of switching array elements and the third and fourth optical elements until the input beam is incident on the trap door.

10. The device as claimed in claim 1 further comprising a spot inter-leaver device comprising:

an inter-leaver array having inter-leaver array elements; and

a plurality of inter-leaver optical elements, wherein the inter-leaver array and the plurality of inter-leaver optical elements are arranged such that a first array of possible input beam positions having first dimensions is rearranged to a second array of possible input beam positions having second dimensions, and wherein the spot inter-leaver is arranged such that an input beam is incident on the spot inter-leaver before the input beam is incident on the input array element.

11. A device for steering an optical beam, comprising:

an array of array elements;

at least one optical element;

at least one trap door in the array of array elements arranged such that an input beam entering the array through the trap door is incident on the at least one optical element, wherein the input beam incident on the at least one optical element travels between the at least one optical element and the array of array elements until the input beam is incident on an output array element in the array of array elements.

12. The device as claimed in claim 11 wherein the at least one optical element comprises first and second optical elements.

13. The device as claimed in claim 11 further comprising third and fourth optical elements, wherein:

the array of array elements comprises more than one row of optical array elements and more than one column of array elements;

one of the columns of array elements comprises switching array elements that are variably operable such that an input beam incident on the switching array element travels a light path to one of the third and fourth optical elements;

the array of array elements and the first and second optical elements are arranged such that the input beam incident on the trap door subsequently travels between one of the rows of array elements and the first and second optical elements until the input beam is incident on the switching array element; and

the input beam incident on the switching array element travels to one of the third or fourth optical elements and subsequently between the column of switching array elements and the third and fourth optical elements until the input beam is incident on the output array element.

14. The device as claimed in claim 11 further comprising an output lens arranged such that an input beam that is incident on the output array element is directed through the output lens and propagates a plane wave in a desired direction.

15. The device as claimed in claim 14 further comprising a spot inter-leaver device comprising:

an inter-leaver array having inter-leaver array elements; and

a plurality of inter-leaver optical elements, wherein the inter-leaver array and the plurality of inter-leaver optical elements are arranged such that a first array of possible input beam positions having first dimensions is rearranged to a second array of possible input beam positions having second dimensions, and wherein the spot inter-leaver is arranged such that an input beam that is incident on the output array element is incident on the spot inter-leaver before the input beam is incident on the output lens.

16. The device as claimed in claim 15 wherein the location of the output array element is chosen such that the input beam enters the inter-leaver array at a desired position such that the plane wave propagates in a desired direction.

17. A spot inter-leaver device comprising:

an inter-leaver array having inter-leaver array elements; and

a plurality of inter-leaver optical elements, wherein the inter-leaver array and the plurality of inter-leaver optical elements are arranged such that a first array of input beam positions having first dimensions is rearranged to a second array of input beam positions having second dimensions.

18. The device as claimed in claim 17 wherein the inter-leaver array elements comprise fixed mirrors, and wherein selected mirrors in the inter-leaver array are tipped to direct selected ones of the input beam positions in the first array to a desired one of the plurality of inter-leaver optical elements.

19. The device as claimed in claim 17 wherein the plurality of inter-leaver optical elements comprises:

first and second inter-leaver optical elements arranged to form a first White cell with the inter-leaver array;

third and fourth inter-leaver optical elements arranged to form a second White cell with the inter-leaver array; and

fifth and six inter-leaver optical elements arranged to form a third White cell with the inter-leaver array.

20. The device as claimed in claim 19 wherein selected inter-leaver array elements are arranged to switch input beams from one of the White cells to another one of the White cells.

21. The device as claimed in claim 17 wherein the inter-leaver array and the plurality of inter-leaver optical elements are arranged such that an input beam at each of the input beam positions bounces between the inter-leaver array and the plurality of inter-lever optical elements m times, and wherein the first array has first dimensions of 1×

N and the second array has second dimensions of (2m+1)×

[N/(2m+1)], where N is the number of input beam positions.

22. A method for steering an optical beam, comprising:

inputting an input light beam from at least one direction; and

reflecting the input light beam between an array of array elements and a plurality of optical elements, wherein at least one array element is arranged such that the input is directed to a particular array element in the array, and wherein the step of reflecting comprises reflecting the input light beam between the array and the plurality of optical elements such that the input light beam reflects off of more than one of the array elements in the array.

23. The method as claimed in claim 22 further comprising receiving an input light beam with an input lens prior to the step of inputting the input light beam.

24. The method as claimed in claim 22 further comprising outputting the input light beam to an output lens after the step of reflecting the input light beam between an array of array elements and a plurality of optical elements.

25. The method as claimed in claim 22 further comprising receiving an input light beam on a spot inter-leaver and directing the light beam to a desired spot in the spot inter-leaver.

26. The method for steering an optical beam as claimed in claim 22 wherein the step of reflecting the input light beam comprises reflecting the input light beam between an array of array elements and first and second optical elements, wherein the array of array elements comprises a row of array elements, and wherein the desired array element in the row of array elements comprises a trap door.

27. The method as claimed in claim 22 wherein the step of reflecting the input light beam comprises reflecting the input light beam between an array of array elements and first and second optical elements, wherein the array of array elements comprises at least one column of array elements and at least one row of array elements, and wherein the desired array element in the array elements comprises a trap door through which the input light beam passes.

28. The method as claimed in claim 27 further comprising reflecting the input light beam after it passes through the trap door between a second array of second array elements and third and fourth optical elements until the input light beam is incident on a desired second array element, wherein the second array of second array elements comprises a row of array elements, and wherein the desired second array element in the row of array elements comprises a second trap door.

29. The method as claimed in claim 22 wherein the step of reflecting the input light beam comprises reflecting the input light beam between an array of array elements and a first and second optical elements, wherein the array of array elements comprises a row of array elements and a column of array elements, and wherein at least one array element in the array comprises a switching array element, and further comprising reflecting the input light beam between the array of array elements and third and fourth optical elements such that the input beam is directed to the desired array element.