SENSOR FOR MEASURING AN EXTERNAL MAGNETIC FIELD
First Claim
1. A sensor for measuring an external magnetic field, the sensor including:
- (a) an optical cavity;
(b) a laser medium which together with the optical cavity has a laser threshold;
(c) a laser pump; and
(d) a radio-frequency (RF) drive applied to the laser medium, such that the laser threshold varies with a change in the external magnetic field;
wherein, the RF drive is applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the value of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output; and
wherein the intensity of the laser output provides a measurement of the value of the external magnetic field.
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Accused Products
Abstract
In general, techniques of this disclosure are directed to a sensor for measuring an external magnetic field. The sensor an optical cavity, a laser medium which together with the optical cavity has a laser threshold, a laser pump, and a radio-frequency (RF) drive applied to the laser medium, such that the laser threshold varies with a change in the external magnetic field. The RF drive may be applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the value of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output. Further, the intensity of the laser output may provide a measurement of the value of the external magnetic field.
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Citations
20 Claims
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1. A sensor for measuring an external magnetic field, the sensor including:
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(a) an optical cavity; (b) a laser medium which together with the optical cavity has a laser threshold; (c) a laser pump; and (d) a radio-frequency (RF) drive applied to the laser medium, such that the laser threshold varies with a change in the external magnetic field; wherein, the RF drive is applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the value of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output; and wherein the intensity of the laser output provides a measurement of the value of the external magnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for measuring the strength of an external magnetic field, the method including the following steps:
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(a) providing a sensor including a laser pump and a laser medium which together with an optical cavity forms a laser threshold; (b) applying a radio-frequency (RF) drive to the laser medium, such that the laser threshold varies with a change in the external magnetic field;
wherein, the RF drive is applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the strength of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output; and
detecting the intensity of the laser output, wherein the intensity of the laser output provides a measurement of the strength of the external magnetic field. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification