System and method for correcting for atmospheric jitter and high energy laser broadband interference using fast steering mirrors

Patent metadata

Field	Value
Publication number	US-11567341-B2
Application number	US-201916559136-A
Country	US
Kind code	B2
Filing date	Sep 3, 2019
Priority date	Sep 3, 2019
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A system includes a high energy laser (HEL) configured to transmit a HEL beam aimed at a first location on an airborne target. The system also includes a beacon illuminator laser (BIL) configured to transmit a BIL beam aimed at a second location on the target, wherein the second location is offset from the first location. The system also includes at least one fast steering mirror (FSM) configured to steer the BIL beam to be spatially and angularly offset from the HEL beam. The system also includes at least one Coudé path FSM configured to simultaneously receive both the HEL beam and the BIL beam and steer the HEL beam and the BIL beam to correct for atmospheric jitter of the HEL beam and the BIL beam while maintaining the offset of the BIL beam from the HEL beam.

First claim

What is claimed is:

1. A system comprising:
a high energy laser (HEL) configured to transmit a HEL beam aimed at a first location on an airborne target;
a beacon illuminator (BIL) configured to transmit a BIL beam aimed at a second location on the target, wherein the second location is offset from the first location;
at least one fast steering mirror (FSM) configured to steer the BIL beam to be spatially and angularly offset from the HEL beam; and
at least one Coudé path FSM configured to simultaneously receive both the HEL beam and the BIL beam and steer the HEL beam and the BIL beam to correct for atmospheric jitter of the HEL beam and the BIL beam while maintaining the offset of the BIL beam from the HEL beam.

2. The system of claim 1 , wherein the at least one Coudé path FSM is configured to receive the HEL beam and the BIL beam after the at least one FSM steers the BIL beam.

3. The system of claim 1 , further comprising:
a camera configured to receive reflected energy of the BIL beam and the HEL beam reflected off the target.

4. The system of claim 3 , further comprising:
at least one controller configured to:
process the reflected energy received by the camera to generate images;
estimate the atmospheric jitter based on the images;
control movement of the at least one FSM to adjust the offset of the BIL beam from the HEL beam; and
control movement of the at least one Coudé path FSM to correct for the atmospheric jitter.

5. The system of claim 4 , wherein the at least one controller is configured to control the movement of the at least one Coudé path FSM based on a difference between uplink jitter and downlink jitter.

6. The system of claim 3 , further comprising an aperture sharing element configured to receive and reflect the HEL beam and the BIL beam while allowing a return spot of the BIL beam reflected off the target to pass through to the camera.

7. The system of claim 6 , further comprising a high speed mirror configured to stabilize the return spot of the BIL beam reflected off the target before being received at the camera.

8. The system of claim 3 , wherein the camera is a high-speed short wave infrared (SWIR) camera co-boresighted with the HEL.

9. The system of claim 1 , further comprising a deformable mirror configured to receive both the HEL beam and the BIL beam and change a shape of a surface to correct for atmospheric wavefront errors.

10. A jitter correction system comprising:
at least one fast steering mirror (FSM) configured to receive a beacon illuminator (BIL) beam transmitted by a BIL and steer the BIL beam to be spatially and angularly offset from a high energy laser (HEL) beam transmitted by a HEL, wherein the HEL beam is aimed a first location on an airborne target, the BIL beam is aimed at a second location on the target, and the second location is offset from the first location; and
at least one Coudé path FSM configured to simultaneously receive both the HEL beam and the BIL beam and steer the HEL beam and the BIL beam to correct for atmospheric jitter of the HEL beam and the BIL beam while maintaining the offset of the BIL beam from the HEL beam.

11. The jitter correction system of claim 10 , wherein the at least one Coudé path FSM is configured to receive the HEL beam and the BIL beam after the at least one FSM steers the BIL beam.

12. The jitter correction system of claim 11 , further comprising:
a camera configured to receive reflected energy of the BIL beam and the HEL beam reflected off the target.

13. The jitter correction system of claim 12 , further comprising:
at least one controller configured to:
process the reflected energy received by the camera to generate images;
estimate the atmospheric jitter based on the images;
control movement of the at least one FSM to adjust the offset of the BIL beam from the HEL beam; and
control movement of the at least one Coudé path FSM to correct for the atmospheric jitter.

14. The jitter correction system of claim 13 , wherein the at least one controller is configured to control the movement of the at least one Coudé path FSM based on a difference between uplink jitter and downlink jitter.

15. The jitter correction system of claim 12 , further comprising an aperture sharing element configured to receive and reflect the HEL beam and the BIL beam while allowing a return spot of the BIL beam reflected off the target to pass through to the camera.

16. The jitter correction system of claim 15 , further comprising a high speed mirror configured to stabilize the return spot of the BIL beam reflected off the target before being received at the camera.

17. The jitter correction system of claim 12 , wherein the camera is a high-speed short wave infrared (SWIR) camera co-boresighted with the HEL.

18. The jitter correction system of claim 10 , further comprising a deformable mirror configured to receive both the HEL beam and the BIL beam and change a shape of a surface to correct for atmospheric wavefront errors.

19. A method comprising:
transmitting, by a high energy laser (HEL), a HEL beam aimed at a first location on an airborne target;
transmitting, by a beacon illuminator (BIL), a BIL beam aimed at a second location on the target, wherein the second location is offset from the first location;
steering, by at least one fast steering mirror (FSM), the BIL beam to be spatially and angularly offset from the HEL beam; and
simultaneously receiving, by at least one Coudé path FSM, both the HEL beam and the BIL beam and steering the HEL beam and the BIL beam to correct for atmospheric jitter of the HEL beam and the BIL beam while maintaining the offset of the BIL beam from the HEL beam.

20. The method of claim 19 , wherein the at least one Coudé path FSM receives the HEL beam and the BIL beam after the at least one FSM steers the BIL beam.

21. The method of claim 19 , further comprising:
receiving, at a camera, reflected energy of the BIL beam and the HEL beam reflected off the target;
processing, by at least one controller, the reflected energy to generate images;
estimating, by the at least one controller, the atmospheric jitter based on the images;
controlling, by the at least one controller, movement of the at least one FSM to adjust the offset of the BIL beam from the HEL beam; and
controlling, by the at least one controller, movement of the at least one Coudé path FSM to correct for the atmospheric jitter.

22. The method of claim 21 , further comprising:
receiving, at an aperture sharing element, the HEL beam and the BIL beam and reflecting the HEL beam and the BIL beam while allowing a return spot of the BIL beam reflected off the target to pass through to the camera.

Assignees

• Raytheon Co

Inventors

• Braunreiter Dennis
• Stonely Aaron
• Young Daniel

Classifications

• H04B10/1125

  using a single common optical path · CPC title

• G01S17/90

  using synthetic aperture techniques · CPC title

• G02B26/0816

  by means of one or more reflecting elements · CPC title

• G02B27/648 Primary

  for automatically maintaining a reference alignment, e.g. in self-levelling surveying instruments (surveying instruments per se G01C) · CPC title

• G02B26/06 Primary

  for controlling the phase of light (G02B26/08 takes precedence {, measuring optical phase difference G01J9/00}) · CPC title