We achieved a continuous, stable, ultrashort pulse hard x-ray point source by focusing 1.8-W, 1-kHz, 50-fs laser pulses onto a novel, 30-µm -diameter, high-velocity, liquid-metal gallium jet. This target geometry avoids most of the debris problems of solid targets and provides nearly 4π illumination. Photon fluxes of 5×10<sup>8</sup> photons/s are generated in a two-component spectrum consisting of a broad continuum from 4 to 14 keV and strong K<sub>α</sub> and K<sub><i>β</i></sub> emission lines at 9.25 and 10.26 keV. This source will find wide use in time-resolved x-ray diffraction studies and other applications.
© 2002 Optical Society of America
(320.5550) Ultrafast optics : Pulses
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(350.5400) Other areas of optics : Plasmas
Georg Korn, Andreas Thoss, Holger Stiel, Ullrich Vogt, Martin Richardson, *Thomas Elsaesser, and Manfred Faubel, "Ultrashort 1-kHz laser plasma hard x-ray source," Opt. Lett. 27, 866-868 (2002)