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12 December 2001 Higher harmonic generation for the high coherent x-ray laser
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We proposed a method to generate highly spatial coherent x-ray laser, in which high order harmonics was used as a seed light of a laser-produced x-ray amplifier. In this case, the intensity and the spatial coherence of the output x-ray depended on the harmonic conversion efficiency and the spectral and spatial coupling efficiencies between the harmonics and the lasing line. Based on the present x-ray lasers using a transient collisional-excitation (TCE) scheme, we investigated the values of these efficiencies, which were needed to realize a high spatial coherence. For this purpose we constructed a Ti:Sapphire laser system in which the central wavelength and the spectral bandwidth were tunable, and we conducted a preliminary experiment. The neon-like Ti x-ray laser at a wavelength of 32.4 nm was taken as an example, and harmonics at the same wavelength was generated using Ar gas target under the conditions that the central wavelength of 810 nm and the pulse duration of 1 ps. The experimental result showed that the characteristics of the harmonics were good enough to use as a seed light of x-ray lasers.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Noboru Hasegawa, Alexander V. Kilpio, Keisuke Nagashima, Tetsuya Kawachi, Masataka Kado, Momoko Tanaka, Shinichi Namba, Kenjiro Takahashi, Kouta Sukegawa, Peixiang Lu, Huajing Tang, Maki Kishimoto, Tai Renzhong, Hiroyuki Daido, and Yoshiaki Kato "Higher harmonic generation for the high coherent x-ray laser", Proc. SPIE 4505, Soft X-Ray Lasers and Applications IV, (12 December 2001);


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