Kilian P Heeg

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Group velocity control is demonstrated for x-ray photons of 14.4 keV energy via a direct measurement of the temporal delay imposed on spectrally narrow x-ray pulses. Subluminal light propagation is achieved by inducing a steep positive linear dispersion in the optical response of 57Fe Mössbauer nuclei embedded in a thin film planar x-ray cavity. The direct(More)
Slow light effects have been measured for x rays using a cavity filled with iron nuclei, where the speed of light was reduced by a factor of 10,000. In vacuum, the propagation of photons proceeds with the same speed for each color (or frequency) of light. A laser pulse, corresponding to a broad range of frequencies, will thus propagate in vacuum without any(More)
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