Magnetometry using sodium fluorescence with synchronous modulation of two-photon resonant light fields
| Autor: | G.S. Pati, Raghwinder Singh Grewal, Renu Tripathi, Mauricio Pulido |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Physics Larmor precession Physics and Astronomy (miscellaneous) Atomic Physics (physics.atom-ph) Magnetometer FOS: Physical sciences Resonance 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Physics - Atomic Physics law.invention Magnetic field Two-photon excitation microscopy Duty cycle law Modulation 0103 physical sciences Atomic physics 0210 nano-technology |
| Zdroj: | Applied Physics Letters. 117:214002 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0030696 |
| Popis: | We have demonstrated a technique for remote magnetometry using fluorescence measurements in a sodium cell. This technique utilizes two-photon resonance instead of single-photon resonance to generate magnetic resonances with synchronous modulation of two laser fields. A strong magnetic resonance with its dip matching the Larmor frequency, ΩL, is produced when a magnetic field perpendicular to the laser propagation direction is applied. A magnetic field sensitivity of 45 pT/√Hz is measured at a 35% modulation duty cycle where ΩL resonance has a maximum amplitude. We have discussed ways to further improve the sensitivity closer to the shot-noise limit by making changes to our existing setup. An additional magnetic resonance at 3ΩL is also formed due to two-photon resonance, which can be utilized in determining the magnetic field orientation. We have developed a theoretical model based on density matrix equations to study the magnetic resonances under different conditions and also for validating our experimental observations. |
| Databáze: | OpenAIRE |
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