Pulsed RF methods for optimization of CW measurements

• US 10,408,890 B2
• Filed: 03/24/2017
• Issued: 09/10/2019
• Est. Priority Date: 03/24/2017
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Bruce, Gregory Scott, Kaup, Peter G., Manickam, Arul
• Primary Examiner(s): Lindsay, Jr., Walter L
• Assistant Examiner(s): Gonzalez, Milton
• Application Number:
  US15/468,356
• Publication Number:
  US 20180275208A1
• Time in Patent Office: 900 Days
• CPC Class Codes: G01R 33/032 using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect

Abstract

A method for magnetic detection includes (a) providing optical excitation to a magneto-optical defect center material using an optical light source, (b) providing pulsed radio frequency (RF) excitation to the magneto-optical defect center material using a pulsed RF excitation source, and (c) receiving an optical signal emitted by the magneto-optical defect center material using an optical detector, such that the magneto-optical defect center material includes a plurality of magneto-optical defect centers and that (a) and (c) occur during (b).

Claims

1. A method for magnetic detection, the method comprising:

(a) providing optical excitation to a magneto-optical defect center material using a single optical light source;

(b) providing pulsed radio frequency (RF) excitation to the magneto-optical defect center material using a pulsed RF excitation source; and

(c) receiving an optical signal emitted by the magneto-optical defect center material using an optical detector,

wherein the magneto-optical defect center material comprises a plurality of magneto-optical defect centers,

wherein (a) and (c) occur during (b), and

wherein the optical light source is continuously applied throughout the method for magnetic detection.

2. The method of claim 1, wherein the step of providing pulsed RF excitation comprises at least one pulse sequence, the at least one pulse sequence including at least one period of idle time followed by at least one period of RF pulse.

3. The method of claim 2, wherein the at least one period of idle time comprises at least one period of reference collection time.

4. The method of claim 3, wherein the at least one period of reference collection time occurs during (a) and (c), but not during (b).

5. The method of claim 2, wherein the at least one period of RF pulse comprises at least one period of settling time and at least one period of collection time.

6. The method of claim 2, wherein the at least one pulse sequence is for a time ranging between 100 μ

s and 2000 μ

s.

7. The method of claim 2, wherein the at least one period of idle time is shorter than the at least one period of RF pulse.

8. The method of claim 7, wherein the pulsed RF excitation occurs at a single frequency.

9. The method of claim 8, wherein a different single frequency is selected for each diamond lattice vector and associated ms=±

1 spin state.

10. The method of claim 2, wherein the at least one period of idle time is longer than the at least one period of RF pulse.

11. The method of claim 10, wherein the pulsed RF excitation frequency is swept.

12. The method of claim 1, wherein following the step of receiving an optical signal, suppressing the optical detector and the pulsed RF source.

13. The method of claim 12, further comprising repolarizing the optical light source to set the magneto-optical defect center material for subsequent measurement.

14. A system for magnetic detection, comprising:

a controller configured to

(a) provide optical excitation to a magneto-optical defect center material using a single optical light source;

(b) provide pulsed radio frequency (RF) excitation to the magneto-optical defect center material using a pulsed RF excitation source; and

(c) receive an optical signal emitted by the magneto-optical defect center material using an optical detector,

wherein the magneto-optical defect center material comprises a plurality of magneto-optical defect centers,

wherein (a) and (c) occur during (b), and

wherein the optical light source is continuously applied throughout (b) and (c).