Full characterization of a high-gain saturated x-ray laser at 13.9 nm
Full characterization of a high-gain saturated x-ray laser at 13.9 nm
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13.9 nm 高增益饱和 X 射线激光器的完整表征
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
H. Takenaka
中科院分区：
文献类型：
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作者：
S. Sebban;H. Daido;N. Sakaya;Y. Kato;K. Murai;Huajing Tang;Y. Gu;G. Huang;Shoujun Wang;A. Klisnick;P. Zeitoun;F. Koike;H. Takenaka
We report the characterization of a saturated collisional Ni-like Ag soft-x-ray laser at 13.9 nm. A main pumping pulse of 140 J in 100 ps $(Iensuremath{approx}8ifmmode imeselse exttimesfi{}{10}^{13} mathrm{W}{mathrm{cm}}^{ensuremath{-}2}),$ the preceded 3 ns before by a prepulse of variable intensity was used to create the amplifying medium. The target length was varied up to 2 cm for the single target and 4 cm for the double target. For the double target the quasi-traveling-wave excitation (QTWE) technique has been used. Time-integrated as well as time-resolved measurement of the $4densuremath{-}4p$ $J=0ensuremath{-}1$ line have been performed for different pumping configurations and target geometry. Due to the very high pumping intensity and the resulting plasma overheating, an exceptionally high-gain coefficient of $19 {mathrm{cm}}^{ensuremath{-}1}$ has been measured leading to the saturation regime for plasma length longer than 8 mm. Time-resolved and time-integrated $3densuremath{-}4f$ spectra of the plasma are also displayed and ionization balance is discussed. Using double-target geometry a narrow divergence is observed due to efficient coupling factor as well as a temporal increase of the x-ray laser pulse duration in the direction of QTWE. The far-field pattern of the x-ray laser beam has been characterized. Two vertically separated bright spots were observed for the double target, while a single spot was observed for the single target. The energy of the double-target x-ray laser beam has been measured to be $ensuremath{sim}300 ensuremath{mu}mathrm{J}$ which closely corresponds to an output power of 5 MW.
We report the characterization of a saturated collisional Ni-like Ag soft-x-ray laser at 13.9 nm. A main pumping pulse of 140 J in 100 ps $(Iensuremath{approx}8ifmmode imeselse exttimesfi{}{10}^{13} mathrm{W}{mathrm{cm}}^{ensuremath{-}2}),$ the preceded 3 ns before by a prepulse of variable intensity was used to create the amplifying medium. The target length was varied up to 2 cm for the single target and 4 cm for the double target. For the double target the quasi-traveling-wave excitation (QTWE) technique has been used. Time-integrated as well as time-resolved measurement of the $4densuremath{-}4p$ $J=0ensuremath{-}1$ line have been performed for different pumping configurations and target geometry. Due to the very high pumping intensity and the resulting plasma overheating, an exceptionally high-gain coefficient of $19 {mathrm{cm}}^{ensuremath{-}1}$ has been measured leading to the saturation regime for plasma length longer than 8 mm. Time-resolved and time-integrated $3densuremath{-}4f$ spectra of the plasma are also displayed and ionization balance is discussed. Using double-target geometry a narrow divergence is observed due to efficient coupling factor as well as a temporal increase of the x-ray laser pulse duration in the direction of QTWE. The far-field pattern of the x-ray laser beam has been characterized. Two vertically separated bright spots were observed for the double target, while a single spot was observed for the single target. The energy of the double-target x-ray laser beam has been measured to be $ensuremath{sim}300 ensuremath{mu}mathrm{J}$ which closely corresponds to an output power of 5 MW.