http://www.umich.edu/aehardt
Prospects for Two-Photon Optical
Magnetometry
E.A.ALDEN, S.M. DEGENKOLB,
T.E. CHUPP, A.E. LEANHARDT
Department of Physics, University of Michigan
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Current State of the Art
Atomic Co-magnetometer
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Magnetometry with Nuclear Spin
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Magnetometry with Nuclear Spin
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Magnetometry with Nuclear Spin
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Magnetometry with Nuclear Spin
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Magnetometry in
Three Level Systems
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Energy Spacings 1S0→ 3P1
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Energy Spacings 1S0→ 3D2
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Fundamental Precision
of Magnetometers
6/15/2011 DAMOP Atlanta, GA
|γ|=0.75 kHz/G
|γ|=0.77 kHz/G
|γ|=1.18 kHz/G
ρ = 5∙1012 cm-3
ρ = 4∙1013 cm-3
ρ = 1022 cm-3
τ>5ms
τ >200s
τ >1300s
DOI: 10.1007/s00340-006-2136-y
DOI: 10.1103/PhysRevLett.87.067601
DOI: 10.1103/PhysRevA.60.1103
DOI: 10.1103/PhysRevLett.102.101601 DOI: 10.1103/PhysRevLett.102.101601
NIST Standard Reference Database 108
Gyromagnetic Ratio Density of Atoms Coherence Time
DOI: 10.1103/PhysRevLett.87.067601
NIST Standard Reference Database 108
NIST Standard Reference Database 108
τN=880s
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Characteristic Rates
6/15/2011 DAMOP Atlanta, GA
31 mHz
56 Hz
1S0→ 3D2
#photons/atom
@ 1W/cm2
ρ = 5∙1012 cm-3
ρ = 1017-1022 cm-3
Density of Atoms
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Our Yb Experiment
Thermal Yb Beam
Stage 1: Polarize & Probe 1S0→ 3P1
Stage 2: Drive & Detect 1S0→ 3D2
Stage 3: Polarize & Probe 1S0→ 3D2
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Current Experimental System
6/15/2011 DAMOP Atlanta, GA
Time ~ 250μs
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Stage 1: Experiment
6/15/2011 DAMOP Atlanta, GA
Pump Waveplate
http://www.umich.edu/aehardt
Stage 1: Polarization Data
6/15/2011 DAMOP Atlanta, GA
F =
1/2
F
= 0
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Stage 2: 1S0→ 3D2
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
1S0→ 3D2 in Xe
6/15/2011 DAMOP Atlanta, GA
DOI:10.1103/PhysRevA.29.721
http://www.umich.edu/aehardt
Conclusions
Diamagnetic atoms optimal for
magnetometry are made accessible
with a two-photon excitation scheme.
• Applications to 129Xe and the nEDM measurement
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt 6/15/2011 DAMOP Atlanta, GA
Charlie Steiner (undergrad)
Tim Chupp (PI) Skyler Degenkolb (grad)
http://www.umich.edu/aehardt
Yb Level Structure
6/15/2011 DAMOP Atlanta, GA
http://www.umich.edu/aehardt
Caveats
• dEDM Hg & Xe
6/15/2011 DAMOP Atlanta, GA