1. Measuring Magnetic Field with Light Presentation of Thesis for the Masters of Science Degree by Andreas Danielsson

2. The Zeeman Effect  Field off  No splitting  Field on   Zeeman triplet

3. The Zeeman Triplet and Its Polarization

4. Information Carrier Orientation of B encoded in the polarization Magnitude of B encoded in the frequency separation  Polarimeter to analyze the polarization states Interferometer to analyze the frequency information

5. MOSS-signal polarizer modulating birefringent crystal polarizer detector light in

6. The MOSS

7. Interferogram for the  component for the two  components

8. Switching between the linear components Contrast modulation

9. Interferogram for the two  –components separately Solid line -lower frequency Dashed line -higher frequency

10. Switching between the circular components Phase modulation Contrast modulation

11. I = I 0 /2(1+s. p) s = (s 1, s 2, s 3 ) p = (cos    sin    sin  1, sin  2 cos  1 ) Select s 1, s 2 or s 3 by appropriate choice of p. Polarimeter

12. Stokes Vectors S  =.5 (sin 2  cos 2  sin 2  sin 2  ) S  =.25 (-sin 2  cos 2  -sin 2  sin 2  -2  cos  ) S  =.25 (-sin 2  cos 2  -sin 2  sin 2  cos  )

13. The Zeeman Spectrometer

14. Raw Signal for Linear Polarization field off field on

15. Raw Signal for Circular Polarization  = 75 o field on  = 105 o field on

16. Magnet close up

17. The real thing

18. All the stuff

19. Demodulation Algorithm (8f) f Frequency spectra MOSS carrier Polarimeter sidebands Demodulation routine in LabView gives field strength and angles in real time.

20. Spectrometer B vs Hall probe B            

21. Constant tilt angle as B increases         

22. Measurement of tilt angle          