measuring magnetic field with light presentation of thesis for the masters of science degree by...
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Measuring
Magnetic
Field withLight
Presentationof
Thesisfor the
Masters of Science Degree
by
Andreas Danielsson
The Zeeman EffectField off
No splittingField on
Zeeman triplet
The Zeeman Triplet and Its Polarization
Information Carrier
Orientation of B encoded in the polarizationMagnitude of B encoded in the frequency separation
Polarimeter to analyze the polarization statesInterferometer to analyze the frequency information
MOSS-signal
polarizermodulatingbirefringentcrystal
polarizer
detector
light in
The MOSS
Interferogram for the component
for the two components
Switching between the linear components
Contrast modulation
Interferogram for the two –components separately
Solid line -lower
frequencyDashed line -higher
frequency
Switching between the circular components
Phase modulation
Contrast modulation
I = I0/2(1+s.p)s = (s1, s2, s3)p = (cos sin sin 1, sin 2 cos 1)
Select s1, s2 or s3
by appropriate choiceof p.
Polarimeter
Stokes Vectors
S=.5 (sin2 cos 2sin2 sin 2)
S=.25 (-sin2 cos 2-sin2 sin 2-2cos )
S=.25 (-sin2 cos 2-sin2 sin 2cos )
The Zeeman Spectrometer
Raw Signal for Linear Polarization
field off
field on
Raw Signal for Circular Polarization
= 75o
field on = 105o
field on
Magnet close up
The real thing
All the stuff
Demodulation Algorithm (8f)
f
Frequencyspectra
MOSS carrier
Polarimeter sidebands
Demodulation routine in LabView gives field strength and angles in real time.
Spectrometer B vs Hall probe B
Constant tilt angle as B increases
Measurement of tilt angle