Soft x-ray lasing in neon-like ions at pump energies below 100 J

Juerg E. Balmer; Ansgar R. Praeg; Frank Loewenthal

doi:10.1117/12.279409

1 November 1997 Soft x-ray lasing in neon-like ions at pump energies below 100 J

Juerg E. Balmer, Ansgar R. Praeg, Frank Loewenthal

Proceedings Volume 3156, Soft X-Ray Lasers and Applications II; (1997) https://doi.org/10.1117/12.279409
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Using the prepulse technique, soft-x-ray lasing is demonstrated on the J equals 0 - 1 transitions of neon-like titanium, chromium, and iron at 32.6, 28.5, and 25.5 nm, respectively, and on the J equals 2 - 1 transitions of copper, zinc, and germanium at 27.9/28.5, 26.2/26.7, and 23.2/23.6 nm, respectively, for pump energies below 100 J, corresponding to irradiances of less than 10 TW/cm². A gain coefficient g equals 2.2 cm^-1 was measured for the 28.5-nm line of Cr at a pump energy of 90 plus or minus 5 J and with a 0.7% prepulse preceding the main pulse by 5 ns, resulting in a gain-length product of approximately 5.5. Angle-resolved spectra indicate a beam divergence of 3 mrad and a beam deflection angle of approximately 6 mrad. The space-resolved spectra show that the J equals 0 - 1 lasing line is emitted from an approximately 60-micrometer wide plasma region, while the nearby continuum emission is produced in a considerably broader plasma region of approximately 230 micrometer. Lasing was observed at pump energies as low as 60 J (approximately 6 TW/cm²), however with considerable shot-to-shot scatter in the data.

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Juerg E. Balmer, Ansgar R. Praeg, and Frank Loewenthal "Soft x-ray lasing in neon-like ions at pump energies below 100 J", Proc. SPIE 3156, Soft X-Ray Lasers and Applications II, (1 November 1997); https://doi.org/10.1117/12.279409

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KEYWORDS

Chromium

Plasma

Copper

Ions

Iron

Laser energy

Titanium

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