Observation of strong soft-x-ray amplification at 8.8 nm in the transient collisional-excitation scheme

We have observed strong amplification with a gain of 14.5 cm{sup -1} for the 4d{yields}4p transition of the Ni-like La ions at a wavelength of 8.8 nm pumped by a chirped pulse amplification Nd:glass laser with an energy of 18 J. In this experiment, the laser pulses consist of a prepulse and a main p...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2004-03, Vol.69 (3), Article 033805
Main Authors: Kawachi, Tetsuya, Sasaki, Akira, Tanaka, Momoko, Kishimoto, Maki, Hasegawa, Noboru, Nagashima, Keisuke, Koike, Masato, Daido, Hiroyuki, Kato, Yoshiaki
Format: Article
Language:English
Subjects:
AMPLITUDES
ATOMIC AND MOLECULAR PHYSICS
ELECTRON TEMPERATURE
ELECTRONS
EXCITATION
GAIN
HEAT TRANSFER
ION TEMPERATURE
KEV RANGE
LANTHANUM IONS
LASER RADIATION
MODULATION
PULSES
SOFT X RADIATION
TRANSIENTS
X-RAY LASERS
X-RAY SOURCES
X-RAY SPECTRA
X-RAY SPECTROSCOPY
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Summary:We have observed strong amplification with a gain of 14.5 cm{sup -1} for the 4d{yields}4p transition of the Ni-like La ions at a wavelength of 8.8 nm pumped by a chirped pulse amplification Nd:glass laser with an energy of 18 J. In this experiment, the laser pulses consist of a prepulse and a main pulse with durations of 200 ps and 7 ps, separated by 250 ps. The keV x-ray spectroscopy and theoretical calculation indicate that the plasma temperature increased effectively by reducing the prepulse intensity, and that the substantial gain is generated in a small overcritical region heated by the electron heat transport.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.69.033805