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The Young Investigators Group led by Jan Rothhardt is based at the Helmholtz Institute Jena and the Institute of Applied Physics. It focuses on the development and applications of high photon flux XUV and soft x-ray sources. Such sources are enabled by high harmonic generation with high average power femtosecond fiber lasers.  .

Previous research included the demonstration of phase matching and efficient high harmonic generation at high repetition rates in the tight focusing regime, resonant enhancement of the macroscopic yield of high harmonic generation by Fano-resonances, and the demonstration of a high photon flux XUV source delivering more than 100 µW of average power per harmonic in the XUV. In addition, high photon flux soft x-rays have been generated up to the carbon absorption edge located at 283 eV. These unique table-top sources will be employed for spectroscopy and nanometer scale imaging in future.

Research areas

Dr. Rothhardt investigates matter on smallest spatial and temporal scales by using modern laser-based XUV and soft x-ray sources. His research interests include:

  • laser-based short wavelength sources
  • nanometer scale imaging techniques
  • ultrafast spectroscopy
  •  XUV spectroscopy of highly-charged ions

Teaching fields

Dr. Rothhardt's teaching activities cover Nonlinear Optics, Laser Physics and Ultrafast Laser Spectroscopy.

Research methods

Dr. Rothhardt's group utilizes a variety of modern imaging and spectroscopy techniques including:

  • coherent diffraction imaging and holographic techniques
  • XUV Laser spectroscopy
  • pump-probe spectroscopy

The group utilizes modern experimental equipment including:

  • high average power femtosecond lasers
  • high photon flux table-top XUV and soft x-ray sources
  • XUV and soft x-ray spectrometers and detectors

>> link to the x-ray spectroscopy and microscopy group

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