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

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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

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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