Nonlinear Optical Rotation Magnetometry University of California, Berkeley Objectives:...
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Nonlinear Optical Rotation Magnetometry University of California, Berkeley Objectives: Proof-of-principle demonstration of precision nonlinear optical rotation magnetometry with sensitivity ~10 pGs(Hz )-1/2 , investigation of its ultimate performance limits Approach: Use large enhancement of optical rotation due to NLOR Combine the eight orders of magn. rotation enhancement demonstrated in this work with precision laser spectropolarimetry Accomplishments: • Observation of ultra-narrow effective widths (1.3 Hz) in magneto- optics • Demonstration of an 8 orders of magnitude rotation enhancement compared to linear magneto- optics Impact: • Demonstration of a new method to prepare, preserve and probe long-lived atomic Zeeman coherence (alignment) • Potential applications in related research involving EIT, Scientific Issues: Assessment of ultimate attainable sensitivity in atomic magnetometry, 3-axis low-field magnetometry, control and characterization of ultra- low magnetic field environment, fundamental physics applications Magnetic Field, Gs rot 20 -20 -40 40 B max 1.4 Gs eff 1.3 Hz
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Nonlinear Optical Rotation Magnetometry University of California, Berkeley
Objectives: Proof-of-principle demonstration of precision nonlinear optical rotation magnetometry with sensitivity ~10 pGs(Hz)-1/2, investigation of its ultimate performance limits
Approach:Use large enhancement of optical rotation due to NLORCombine the eight orders of magn. rotation enhancement demonstrated in this work with precision laser spectropolarimetry developed for atomic parity violation experiments
Accomplishments:• Observation of ultra-narrow effective widths (1.3 Hz) in magneto-optics • Demonstration of an 8 orders of magnitude rotation enhancement compared to linear magneto-optics• Realization of a prototype low-field 3-axis magnetometer
Impact: • Demonstration of a new method to prepare, preserve and probe long-lived atomic Zeeman coherence (alignment)• Potential applications in related research involving EIT, coherent dark resonances, phaseonium; in experiments on P, T-violation
Scientific Issues: Assessment of ultimate attainable sensitivity in atomic magnetometry, 3-axis low-field magnetometry, control and characterization of ultra-low magnetic field environment, fundamental physics applications
Magnetic Field, Gs
rot
20-20-40 40
Bmax1.4 Gs eff1.3 Hz
Light intensity: 100 W/cm2. Effective laser beam diameter: ~ 2 mm. Rb-cell at room temperature. The solid line is a fit to the developed model. The insert shows a detailed scan of the near-zero Bz-field region.
"Nested" Effects in Nonlinear Magneto-Optical RotationLarge Dynamic Range Magnetometry
-1 0 1
Longitudinal Magnetic Field Bz (Gs)
5
-5
0
Optical Rotation s (mrad)5-5
Bz (Gs)
s
(mra
d)
-1
1
Nonlinear Magneto-Optical Rotation in Arbitrarily-Directed Magnetic FieldsThree Dimensional Magnetometry
Observed phenomenon:
Dramatic changes of the shape of NMOR in the presence of transverse magnetic fields Btr~Bz
First realization:
Three Dimensional Magnetometrywas used
to compensate residual magnetic fields and to reach narrowest observed NLOR feature with effective resonance width:
eff1.3 Hz
Idea for application:
The found strong dependence can be used for: Three Dimensional Magnetometry
Optical Rotation s (mrad)
0
0
0
0
0
0
0-10 10 -10 100
12
-2-1
1 2
-2-1
1 2
-1-2
Longitudinal Magnetic Field Bz (Gs)
By0.7 Gs
Bx0 Gs
Bx-1.2 Gs
Bx3.7 Gs
By0.04 Gs
By-0.5 Gs
By0 GsBx2 Gs
Bz2.8 Gs
