Research
SR-FEL experiments and collaborationsThe experimental activity at the Elettra SR-FEL, except for the machine physics research, is based on pump-probe schemes. Both condensed matter and gas phase experiments where performed using the coherent emission produced by the source. |
Research fieldsResearch takes place in fields related to the the physics of accelerators, the develop of new light-sources, in particular the free-electron lasers. |
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Research @ SR-FEL
The SR-FEL group has a strong interest in selected topics related to accelerator physics, in particular the physics of FEL. Past and current research has been focused on the characteristics of FEL light. The emission by variable-polarization undulators has been deeply investigated, as well as new schemes for this kind of sources. An important topic of research is devoted to new sources for the seeding process. |
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Pump and probe scheme
The pump/probe spectroscopy is an analitical tecnique which is used to study a large class of phenomena. It enables to follow in real time the vibrational motions coupled to electronic transitions. It requires at least two ultrafast (sub-ps) beams.
In a pump probe experiment the sample is excited by one pulse train (pump) and the changes it induces are then probed by the second pulse train. By means of an optical delay line one can vary the relative delay between the pump and the probe pulses, in order to investigate dynamics of the process.
A pictographic representation of the pump/probe scheme is shown here:
The Ti:Sa seed laser and the FEL emission are naturally synchronized and overlapped, so it is necessary to use optimized optics capable of separating light by different wavelength. In order to vary the delay between the pump and the probe, an optical delay line is used.
