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12 December 2001 X-ray laser research at Advanced Photon Research Center of JAERI, Kansai
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Abstract
We have observed lasing on Ne-like 3s-3p line from titanium (32.4 nm), Ni-like 4p-4d line from silver (13.9 nm) and tin (11.9 nm) with the transient collisional excitation (TCE) scheme that uses combinations of a long pre-pulse (approximately ns) and a short main pulse (approximately ps) or a short pre-pulse (approximately ps) and a short main pulse (approximately ps). A gain coefficient of 24cm-1 have been measured for plasma length up to 4mm with silver slab targets and 14cm-1 up to 6 mm with tin slab targets. We have installed a step mirror in the focusing system to generate traveling wave on the target. The traveling speed on the target is measured to be 3.08 cm/s and very close to the traveling speed of light. The traveling wave system improves the gain coefficient to 35cm-1 from 24cm-1 for Ni-like Ag and to 30cm-1 from 14cm-1 for Ni-like Sn. The strong gain saturation has been observed for the Ni-like Ag and Ni-like Sn. The output energy of the N-like Sn x-ray laser is 20 (mu) J. Spatial beam profiles of propagating x-ray lasers through gain plasma have been measured and are indicating localization of very high gain area and x-ray laser refraction.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Masataka Kado, Tetsuya Kawachi, Momoko Tanaka, Noboru Hasegawa, Kenjiro Takahashi, Shinichi Namba, Kouta Sukegawa, Akira Sasaki, Peixiang Lu, Huajing Tang, Keisuke Nagashima, Hiroyuki Daido, Alexander V. Kilpio, and Yoshiaki Kato "X-ray laser research at Advanced Photon Research Center of JAERI, Kansai", Proc. SPIE 4505, Soft X-Ray Lasers and Applications IV, (12 December 2001); https://doi.org/10.1117/12.450603
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