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Brilliant X-ray sources are of great interest for many research fields frombiology via medicine to material research. The quest for a cost-effective,brilliant source with unprecedented temporal resolution has led to the recentrealization of various high-intensity-laser-driven X-ray beam sources. Here wedemonstrate the first all-laser-driven, energy-tunable and quasi-monochromaticX-ray source based on Thomson backscattering. This is a decisive step beyondprevious results, where the emitted radiation exhibited an uncontrolled broadenergy distribution. In the experiment, one part of the laser beam was used todrive a few-fs bunch of quasi-monoenergetic electrons from a Laser-WakefieldAccelerator (LWFA), while the remainder was scattered off the bunch in anear-counter-propagating geometry. When the electron energy was tuned from10-50 MeV, narrow-bandwidth X-ray spectra peaking at 5-35keV were directlymeasured, limited in photon energy by the sensitivity curve of our X-raydetector. Due to the ultrashort LWFA electron bunches, these beams exhibitfew-fs pulse duration.

Tunable, all-optical quasi-monochromatic Thomson X-ray source