Angle-resolved observation of X-ray second harmonic generation in diamond
Master Thesis Defense
2:00 pm
Jorgensen Hall Room: 247
Speaker: Bjoern Senfftleben
Adviser: Matthias Fuchs
Abstract:
This thesis reports angularly-resolved observation of X-ray second harmonic generation (XSHG) in diamond at several phase-matching geometries. The XSHG signal was produced by ultra-short, highly intense X-ray pulses with a photon energy of 9.831 keV generated by a free-electron laser. In some geometries for high pulse energies more than 10 second harmonic photons per pulse were generated.
Different phase-matched geometries were used for XSHG to investigate the angular dependence of the efficiency of the process. Furthermore, for each phase-matching condition, the quadratic dependence for second harmonic generation at each geometry was verified and the crystal rocking curves were measured. The results for the angular dependence of the efficiency are in good agreement with the theory as shown by simulations (done by Priyanka Chakraborti).
Improved interpretations of the data are enabled by a new analysis algorithm that interprets the detected photon signal using a deeper understanding of the used 2D detector. Further an extensive analysis on established interpretation methods is presented.
Adviser: Matthias Fuchs
Abstract:
This thesis reports angularly-resolved observation of X-ray second harmonic generation (XSHG) in diamond at several phase-matching geometries. The XSHG signal was produced by ultra-short, highly intense X-ray pulses with a photon energy of 9.831 keV generated by a free-electron laser. In some geometries for high pulse energies more than 10 second harmonic photons per pulse were generated.
Different phase-matched geometries were used for XSHG to investigate the angular dependence of the efficiency of the process. Furthermore, for each phase-matching condition, the quadratic dependence for second harmonic generation at each geometry was verified and the crystal rocking curves were measured. The results for the angular dependence of the efficiency are in good agreement with the theory as shown by simulations (done by Priyanka Chakraborti).
Improved interpretations of the data are enabled by a new analysis algorithm that interprets the detected photon signal using a deeper understanding of the used 2D detector. Further an extensive analysis on established interpretation methods is presented.