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Nishikino M. Tanaka M. Ochi Y. Kishimoto M. Ishino M. Hasegawa N. Kado M. Sukegawa K. Kawachi T. Nagashima K. 《IEEE journal of selected topics in quantum electronics》2004,10(6):1382-1387
We have recently reported the successful development of a fully coherent X-ray laser (XRL) at 13.9 nm by an oscillator-amplifier configuration with two targets. In the experiment, a seed XRL beam from the first target is injected into a plasma amplifier at the second target. The observed XRL beam has full spatial coherence and 0.2 mrad of nearly diffraction-limited divergence. In order to improve the output fluence, the amplification properties of the XRL beam have been investigated using various plasma lengths of the second amplifier target. The output energy has been improved by a factor of ten, increasing the length of the gain region to 10 mm, resulting in about 0.2 /spl mu/J of output energy. 相似文献
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Zhang Z Nishimura H Namimoto T Fujioka S Arikawa Y Nishikino M Kawachi T Sagisaka A Hosoda H Orimo S Ogura K Pirozhkov A Yogo A Okano Y Kiriyama H Kondo K Ohshima S Azechi H 《The Review of scientific instruments》2012,83(5):053502
X-ray line spectra ranging from 17 to 77 keV were quantitatively measured with a Laue spectrometer, composed of a cylindrically curved crystal and a detector. Either a visible CCD detector coupled with a CsI phosphor screen or an imaging plate can be chosen, depending on the signal intensities and exposure times. The absolute sensitivity of the spectrometer system was calibrated using pre-characterized laser-produced x-ray sources and radioisotopes. The integrated reflectivity for the crystal is in good agreement with predictions by an open code for x-ray diffraction. The energy transfer efficiency from incident laser beams to hot electrons, as the energy transfer agency for specific x-ray line emissions, is derived as a consequence of this work. 相似文献
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Nishikino M Hasegawa N Kawachi T Yamatani H Sukegawa K Nagashima K 《Applied optics》2008,47(8):1129-1134
We have improved a highly coherent x-ray laser at 13.9 nm using an oscillator-amplifier configuration. To improve a high-brilliance x-ray laser, we adopted traveling wave pumping for the amplifier target and rotated the amplifier target 3-4 mrad in the counterclockwise direction. Thereby, a seed x-ray laser can be amplified by medium plasma of the amplifier target with a high gain coefficient. The amplified x-ray laser has the output energy of approximately 1.3 microJ, corresponding to a large photon flux of 6.5 x 10(10) photons/pulse and a high peak brilliance of 5 x 10(26) photons/(s x mm(2) x mrad(2) x 0.01% bandwidth). 相似文献
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