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Schematic of x-ray generation by laser irradiation of Ar gas flow. X rays are measured with the x-ray CCD in the forward direction. The radiographic image of a biological specimen (small spiders) is recorded with an imaging plate which replaces the x-ray CCD.
X-ray spectra of Ar when the laser beam was focused (a) before and (b) on the edge of the gas target. The x-ray spectrum of Cu with a solid target is shown in (a) by the dotted line. The inset in (b) shows the electron spectrum observed in the forward direction.
(Color online) (a) Dependence of the intensity on the laser focus position relative to the edge of the gas, where + refers to the position of the gas away from the best focus. (b) and (c) show the shadowgraphs of the laser propagation in the gas obtained at the nozzle positions B and A, respectively. The position of the nozzle, which is located below the laser beam axis, and the diffraction cone of the laser beam in vacuum are marked.
(Color online) X-ray radiography of two small spiders placed between the Ar x-ray source and the imaging plate. (a) is the absorption-contrast image and (b) is the phase-contrast image.
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