Improvement in efficiency and coherence of collisional excitation x-ray lasers

Journal Article · Mon May 01 04:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.47958· OSTI ID:21153839

Daido, H; Kato, Y; Kodama, R; Murai, K; Yuan, G; Takagi, M; Takabe, H; Nakai, S; Nam, C H; Choi, I W; Neely, D; MacPhee, A ^[1]

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1. Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565 Japan (Japan)

We have obtained improved performance in terms of intensity and beam divergence (6 mrad) at J=0-1 line of a germanium soft x-ray laser with a curved slab target which compensates beam deflection due to plasma density gradient. At the first stage of this experiment, the pump laser pulse width was 1 ns and the average irradiance on target was 1.7x10{sup 13} W/cm{sup 2}. The lasing performance of the J=0-1 line suggested improvement in efficiency with shorter pulse pumping. In order to optimize the plasma density and temperature profiles of the expanding germanium plasma, we have employed double pulse pumping of 100 ps pulse width with 300 ps separation having a total energy of 300 J. This has resulted in a further improvement in the x-ray laser intensity and the beam divergence (2 mrad). We also describe briefly the experimental result of Ni-like collisional excitation lasers having wavelengths of 6-8 nm.

• OSTI ID: 21153839
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 332; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EFFICIENCY
EXCITATION
GERMANIUM IONS
ION COLLISIONS
ION TEMPERATURE
LASER-PRODUCED PLASMA
MULTICHARGED IONS
PERFORMANCE
PLASMA DENSITY
PLASMA EXPANSION
PULSES
PUMPING
RADIANT FLUX DENSITY
SOFT X RADIATION
WAVELENGTHS
X-RAY LASERS