Control system including a beam stabilizer and a phase modulation capable acousto-optic modulator for diverting laser output intensity noise to a first order laser light beam and related methods

Patent metadata

Field	Value
Publication number	US-10466516-B2
Application number	US-201815900936-A
Country	US
Kind code	B2
Filing date	Feb 21, 2018
Priority date	Nov 3, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A laser system may include a laser source configured to generate a laser light beam, a beam stabilizer downstream from the laser light source, and an acousto-optic modulator (AOM). The AOM may include an acousto-optic medium configured to receive the laser light beam, and a phased array transducer including a plurality of electrodes coupled to the acousto-optic medium and configured to cause the acousto-optic medium to output a zero order laser light beam and a first order diffracted laser light beam. The system may further include a photodetector configured to receive a sampled laser light beam split from the zero order beam and generate a feedback signal associated therewith, and an RF driver configured to generate an RF drive signal to the phased array transducer electrodes so that noise is diverted to the first order diffracted laser light beam based upon the feedback signal.

First claim

That which is claimed is:

1. A laser system comprising:
a laser source configured to generate a laser light beam;
a beam stabilizer downstream from the laser light source;
an acousto-optic modulator (AOM) comprising
an acousto-optic medium configured to receive the laser light beam, and
a phased array transducer comprising a plurality of electrodes coupled to the acousto-optic medium and configured to cause the acousto-optic medium to output a zero order laser light beam and a first order diffracted laser light beam;

a beamsplitter downstream from the AOM and configured to split a sampled laser light beam from the zero order laser light beam;
a photodetector configured to receive the sampled laser light beam and generate a feedback signal associated therewith; and
a radio frequency (RF) driver configured to generate an RF drive signal to the phased array transducer electrodes so that noise is diverted to the first order diffracted laser light beam based upon the feedback signal.

2. The laser system of claim 1 wherein the beam stabilizer is configured to correct a positional displacement of the laser light beam.

3. The laser system of claim 1 wherein the beam stabilizer comprises:
a position mirror optically aligned with the laser light beam from the laser source;
a servo motor configured to move the position mirror;
a position sensor configured to measure a positional displacement of the laser light beam; and
a servo controller coupled to the servo motor and configured to actuate the servo motor to stabilize the laser light beam based upon the position sensor.

4. The laser system of claim 1 wherein the beam stabilizer comprises:
a position mirror optically aligned with the zero order laser light beam from the acousto-optic medium;
a servo motor configured to move the position mirror;
a position sensor configured to measure a positional displacement of the zero order laser light beam; and
a servo controller coupled to the servo motor and configured to actuate the servo motor to stabilize the zero order laser light beam based upon the position sensor.

5. The laser system of claim 1 wherein the beam stabilizer is configured to correct an angular displacement of the laser light beam.

6. The laser system of claim 1 wherein the beam stabilizer comprises:
an angle mirror optically aligned with the laser light beam from the laser source;
a servo motor configured to move the angle mirror;
an angle sensor configured to measure an angular displacement of the laser light beam; and
a servo controller coupled to the servo motor and configured to actuate the servo motor to stabilize the laser light beam based upon the angle sensor.

7. The laser system of claim 1 wherein the beam stabilizer comprises:
an angle mirror optically aligned with the zero order laser light beam from the acousto-optic medium;
a servo motor configured to move the angle mirror;
an angle sensor configured to measure an angular displacement of the zero order laser light beam; and
a servo controller coupled to the servo motor and configured to actuate the servo motor to stabilize the zero order laser light beam based upon the angle sensor.

8. The laser system of claim 1 wherein the RF driver is configured to drive alternating electrodes of the phased array transducer electrodes with different phases.

9. The laser system of claim 1 wherein an RF power level associated with the RF drive signal has a constant power.

10. The laser system of claim 1 further comprising an ion trap, and wherein the beamsplitter is configured to direct the zero order laser light beam from the AOM to the ion trap.

11. A laser system comprising:
a laser source configured to generate a laser light beam;
a beam stabilizer downstream from the laser light source and configured to correct at least one of an angular displacement and a positional displacement of the laser light beam;
an acousto-optic modulator (AOM) comprising
an acousto-optic medium configured to receive the laser light beam from the beam stabilizer, and
a phased array transducer comprising a plurality of electrodes coupled to the acousto-optic medium and configured to cause the acousto-optic medium to output a zero order laser light beam and a first order diffracted laser light beam;

a beamsplitter downstream from the AOM and configured to split a sampled laser light beam from the zero order laser light beam;
a photodetector configured to receive the sampled laser light beam and generate a feedback signal associated therewith; and
a radio frequency (RF) driver configured to generate an RF drive signal to the phased array transducer electrodes so that noise is diverted to the first order diffracted laser light beam based upon the feedback signal.

12. The laser system of claim 11 wherein the beam stabilizer comprises:
a position mirror optically aligned with the laser light beam from the laser source;
a servo motor configured to move the position mirror;
a position sensor configured to measure a positional displacement of the laser light beam; and
a servo controller coupled to the servo motor and configured to actuate the servo motor to stabilize the laser light beam based upon the position sensor.

13. The laser system of claim 11 wherein the beam stabilizer comprises:
an angle mirror optically aligned with the laser light beam from the laser source;
a servo motor configured to move the angle mirror;
an angle sensor configured to measure an angular displacement of the laser light beam; and
a servo controller coupled to the servo motor and configured to actuate the servo motor to stabilize the laser light beam based upon the angle sensor.

14. The laser system of claim 11 wherein the RF driver is configured to drive alternating electrodes of the phased array transducer electrodes with different phases.

15. The laser system of claim 11 further comprising an ion trap, and wherein the beamsplitter is configured to direct the zero order laser light beam from the AOM to the ion trap.

16. A method comprising:
generating a laser light beam using a laser source;
stabilizing the laser light beam using a beam stabilizer downstream from the laser light source;
causing an acousto-optic medium to output a zero order laser light beam from the stabilized laser light beam using a phased array transducer comprising a plurality of electrodes coupled to the acousto-optic medium;
splitting a sampled laser light beam from the zero order laser light beam using a beamsplitter downstream from the acousto-optic medium;
generating a feedback signal associated with the sampled laser light beam using a photodetector; and
generating a radio frequency (RF) drive signal for the phased array transducer electrodes with an RF driver so that noise is diverted to the first order diffracted laser light beam based upon the feedback signal.

17. The method of claim 16 wherein stabilizing comprises stabilizing an angular displacement of the laser light beam.

18. The method of claim 16 wherein stabilizing comprises stabilizing a positional displacement of the laser light beam.

19. The method of claim 16 wherein causing comprises driving alternating electrodes of the phased array transducer electrodes with different phases.

20. A method comprising:
generating a laser light beam using a laser source;
causing an acousto-optic medium to output a zero order laser light beam from the laser light beam using a phased array transducer comprising a plurality of electrodes coupled to the acou

Assignees

• Harris Corp

Inventors

• Morse Randall K
• Wasilousky Peter A
• Burberry Lee M
• Lange Michael R
• Logan Catheryn D
• Corey Christopher A

Classifications

• G02F1/113 Primary

  Circuit or control arrangements · CPC title

• G02F1/332

  comprising a plurality of transducers on the same crystal surface, e.g. multi-channel Bragg cell · CPC title

• G02F1/292

  by controlled diffraction or phased-array beam steering (controlled diffraction for optical switching G02F1/31) · CPC title

• H01S3/0085

  Modulating the output, i.e. the laser beam is modulated outside the laser cavity · CPC title

• G02F2201/58

  Arrangements comprising a monitoring photodetector · CPC title