Department of Physical Chemistry, Fritz Haber Institute of the MPG 

Lattice Dynamics Group

Alex Paarmann
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Open Positions

As newly established group, we are currently looking for highly motivated and qualified Masters and doctoral candidates, as well as postdoctoral fellows, preferably with a strong background and interest in ultrafast dynamics in solids. Should you be interested in joining our research efforts, please do not hesitate to contact:

Alex Paarmann <>
Fritz Haber Institute of the Max Planck Society 
Faradayweg 4-6, 14195 Berlin;
there in Building A, room 1.16. 
phone: +49 30 8413-5121; 
fax: +49 30 8413-5106.
Masters projects:

Second Harmonic Spectroscopy with Infrared Free Electron Lasers

Second harmonic generation is a nonlinear optical effect that occurs at surfaces and non-inversion symmetric media. This project will investigate the efficiency of second harmonic generation in the mid-infrared spectral region from semiconductors and metal surfaces, as well as micro-structured hybrid metal-semiconductor interfaces. Making use of the picosecond pulses and spectral tunability of the mid-infrared free electron laser at the FHI, these investigations can be performed as a spectroscopy, specifically addressing spectral resonances in the nonlinear optical response of the sample.
The  applicant should provide a good background in optics and solid state physics, as well as a strong affinity to experimental work

Frequency Upconversion of Infrared Free Electron Laser Radiation

Time-resolved pump-probe experiments with the mid-infrared free electron laser (IR-FEL) at the FHI as pump pulse and femtosecond NIR pulses from a table top laser as probe pulses require precise knowledge and control of the relative timing of these laser pulses. For that purpose, frequency upconversion of the IR FEL pulses with near-IR table top laser pulses in a nonlinear optical crystal will be implemented. The project will start out with proof-of-principle experiments using a multi-nanosecond YLF near-IR laser. In a second stage, the experiment will be performed with a synchronized femtosecond pulse train from a fiber laser. Ultimately, this setup will implemented to be used as relative timing feedback between the FEL and near-IR laser in time-resolved pump-probe experiments.
The  applicant should provide a good background in optics, preferably nonlinear or ultrafast optics, as well as a strong affinity to experimental work.