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Matthias C. Hoffmann

Research


2011-Present

Staff Scientist, LCLS Laser Department, SLAC National Accelerator Laboratory 
Development of intense THz sources for the Linac Coherent Light 
  • Enabling THz-pump/Xray probe spectroscopy for users at LCLS. 
  • Ultrafast spectroscopy of correlated electron systems using strong infrared and THz sources.

2009-2011

Research Scientist, Max Planck Group for Structural Dynamics, CFEL/DESY Group of Prof. Andrea Cavalleri
Structural dynamics of correlated electron systems
  • Ultrafast spectroscopy of correlated electron systems (e.g., LSCO, LESCO, PCMO, BEDT F2TCNQ) 
  • using strong infrared and THz sources. 
  • Nonlinear spectroscopy of manganites and cuprates using intense tabletop sources and THz free electron lasers.

2006-2009

Postdoctoral Researcher, Prof. Keith A. Nelson’s Group MIT
High power THz generation and THz nonlinear spectroscopy
  • Developed new techniques for generating intense THz radiation from femtosecond laser pulses with record pulse energy (micro-joules) using tabletop systems. 
  • Developed THz-pump-THz-probe techniques to study nonlinear carrier dynamics in bulk semiconductors. 
  • Investigated the nonlinear properties of relaxor-ferroelectrics and vibrational modes in organic molecular crystals in the THz regime.

2005

Research assistant, Danish Technical University,  Peter Jepsen’s Group
Optical pump-probe spectroscopy on LT-GaAs and THz waveguide spectroscopy
  • Optimize material properties of LT-GaAs used in THz research by way of optical pump-probe spectroscopy. 
  • Design and fabricate THz photoconductive antenna receivers and transmitters using photolithographic techniques. 

2002-2006

Research assistant University of Freiburg, Prof. Hanspeter Helm’s group
THz-time domain spectroscopy on molecular organic crystals. 
  • ​Developed a compact THz-time domain spectrometer setup based on fiber-coupled femtosecond (fs) pulses using single mode and photonic crystal fibers. 
  • ​​Developed a high-speed THz imaging system for chemical recognition in the THz range. Carried out spectroscopy of organic molecular crystals (e.g., carbohydrates) and biologically relevant molecules (e.g., DNA bases) using high repetition fs-lasers and amplifier systems.

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SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy