Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 26: Quantum effects: Miscellaneous
Q 26.1: Talk
Tuesday, March 18, 2014, 14:00–14:15, DO26 208
Many-electron approach towards the free-electron laser in the quantum regime — •Peter Kling1,2, Rainer Endrich1,2, Enno Giese2, Roland Sauerbrey1, and Wolfgang P. Schleich2 — 1Helmholtz-Zentrum Dresden-Rossendorf e V, D-01328 Dresden, Germany — 2Institut für Quantenphysik and Center for Integrated Science and Technology, Universität Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
Free-electron laser (FEL) devices stand out due to their wide tunability of the emitted radiation ranging from infrared to X-rays. Although the first theoretical approaches towards the FEL were based on quantum mechanics, it turned out that a description within classical electrodynamics is sufficient - at least for all existing devices. However, due to the technological progress in recent years a regime seems in reach where classical physics fails and quantum mechanical phenomena rule.
Here, the recoil the electron experiences during the interaction with the fields becomes important and the dynamics of the electron is reduced to two possible momentum states. In contrast to our previous approach, where we have used a single-electron model and found an analogy of the quantum regime of the FEL to the Jaynes-Cummings model, we now develop a many-electron description, where all electrons interact simultaneously with the radiation field. For short times we obtain an exponential gain, similar to the case of the classical high-gain free-electron laser.