Selected volume continuous illumination magnetometer

• US 10,345,396 B2
• Filed: 12/15/2016
• Issued: 07/09/2019
• Est. Priority Date: 05/31/2016
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Manickam, Arul, Kaup, Peter G., Bruce, Gregory Scott, Lew, Wilbur
• Primary Examiner(s): Lee, Susan S
• Application Number:
  US15/380,419
• Publication Number:
  US 20170343617A1
• Time in Patent Office: 936 Days
• CPC Class Codes: G01R 33/032 using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect

Abstract

A system for magnetic detection, includes a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, a radio frequency (RF) excitation source, an optical detector and an optical light source. The RF excitation source is configured to provide RF excitation to the material. The optical detector is configured to receive an optical signal emitted by the material. The optical light source is configured to provide optical light to the material, and includes a readout optical light source and a reset optical light source. The readout optical light source is configured to illuminate light in a first illumination volume of the material. The reset optical light source is configured to illuminate light in a second illumination volume of the material, the second illumination volume being larger than and encompassing the first illumination volume. The reset optical light source provides a higher power light than the readout optical light source.

Claims

1. A method for magnetic detection, comprising:

irradiating a magneto-optical defect center material comprising a plurality of magneto-optical defect centers with a radio frequency pulse;

irradiating the magneto-optical defect center material with optical excitation from a readout optical light source to excite an electronic transition of spin states in the magneto-optical defect center material; and

detecting an optical signal from the magneto-optical defect center material after a time when the magneto-optical defect center material is irradiated with the radio frequency pulse,

wherein the irradiating the magneto-optical defect center material with optical excitation occurs during the irradiating the magneto-optical defect center material with the radio frequency pulse.

2. The method of claim 1, wherein the irradiating the magneto-optical defect center material with optical excitation from a readout optical light source is performed in a continuous optical excitation manner.

3. The method of claim 1, wherein the irradiating the magneto-optical defect center material with the radio frequency pulse is performed according to a Ramsey pulse sequence or a spin-echo pulse sequence.

4. A system for magnetic detection, comprising:

a magneto-optical defect center material comprising a plurality of magneto-optical defect centers;

a radio frequency (RF) excitation source configured to provide RF excitation to the magneto-optical defect center material;

an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material; and

an optical light source configured to provide optical light to the magneto-optical defect center material, the optical light source comprising;

a readout optical light source configured to illuminate light in a first illumination volume of the magneto-optical defect center material; and

a reset optical light source configured to illuminate light in a second illumination volume of the magneto-optical defect center material, the second illumination volume being larger than and encompassing the first illumination volume, wherein the reset optical light source provides a higher power light than the readout optical light source.

5. The system of claim 4, wherein the readout optical light source is a laser and the reset optical light source is a bank of LED flash-bulbs.

6. The system of claim 4, wherein the readout optical light source is an LED and the reset optical light source is a bank of LED flash-bulbs.

7. The system of claim 4, wherein the readout optical light source has a higher duty cycle than the reset optical light source.

8. A method for magnetic detection, comprising:

irradiating a magneto-optical defect center material comprising a plurality of magneto-optical defect centers with RF excitation;

illuminating light in a first illumination volume of the magneto-optical defect center material via a readout optical light source; and

illuminating light in a second illumination volume of the magneto-optical defect center material via a reset optical light source, the second illumination volume being larger than and encompassing the first illumination volume, wherein the reset optical light source provides a higher power light than the readout optical light source.

9. The method of claim 8, wherein the readout optical light source is a laser and the reset optical light source is a bank of LED flash-bulbs.

10. The method of claim 8, wherein the readout optical light source is an LED and the reset optical light source is a bank of LED flash-bulbs.

11. The method of claim 8, wherein the readout optical light source has a higher duty cycle than the reset optical light source.

12. A method for magnetic detection, comprising:

irradiating a magneto-optical defect center material comprising a plurality of magneto-optical defect centers with a first radio frequency pulse;

irradiating the magneto-optical defect center material with a second radio frequency pulse after the first radio frequency pulse;

irradiating the magneto-optical defect center material with optical excitation from a readout optical light source to excite an electronic transition of spin states in the magneto-optical defect center material; and

detecting an optical signal from the magneto-optical defect center material after a time when the magneto-optical defect center material is irradiated with the first and the second radio frequency pulse,

wherein the irradiating the magneto-optical defect center material with optical excitation occurs during the irradiating the magneto-optical defect center material with the first and the second radio frequency pulse.

13. The method of claim 12, wherein the irradiating the magneto-optical defect center material with optical excitation from a readout optical light source is performed in a continuous optical excitation manner.

14. The method of claim 12, wherein the irradiating the magneto-optical defect center material with the first and the second radio frequency pulse is performed according to a RF pulse sequence or a spin-echo pulse sequence.