Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 33: Quantum Optics IV
Q 33.3: Vortrag
Mittwoch, 25. März 2015, 11:30–11:45, B/gHS
Auger-pumped superradiance at 108.9nm in xenon — •wen-te liao1,2, clemens weninger1,2, laurent mercadier1,2, and nina rohringer1,2 — 1Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany — 2Center for Free Electron Laser Science, 22607 Hamburg, Germany
X-ray Free Electron Lasers (XFELs) open entirely new directions for quantum optics in the x-ray domain. Superradiance is the collective spontaneous emission of photons by a group of quantum emitters. The superradiant decay rate of an ensemble of emitters can vastly exceed that of a single atom and strongly depends on the geometric shape of the active volume. Ionizing Xenon at the 4d threshold by soft x-rays, the subsequent Auger-decay of the 4d hole results in a population inversion of the 5p to 5s shell in doubly ionized Xenon, that was previously exploited to realize amplified spontaneous emission at 108.9 nm [1,2]. With XFEL sources, the necessary conditions for superradiance can be met. Changing the aspect ratio of the superradiant volume via adjusting the focus size and depth of the XFEL radiation can result in emission of transform limited pulses of high intensities, ranging from fs to ps duration. This opens the path to a photon source with a bandwidth tunable on demand within a wide range. We present numerical results of the superradiant emission based on a Maxwell-Bloch approach for parameters available at XFEL sources.
[1] H. C. Kaptey, R. W. Lee, and R. W. Falcone, Phys. Rev. Lett. 57, 2939 (1986).
[2] M.H. Sher, et al., Optics Letters 12, 891 (1987)