Picosecond x-rays from subpicosecond-laser-produced hot-dense matter

D. Umstadter, J. Workman, A. Maksimchuk, X. Liu, U. Ellenberger, J. S. Coe, C. Y. Chien

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Short-pulse, high-intensity laser-plasma interactions are investigated experimentally with temporally and spectrally resolved soft x-ray diagnostics. The emitted x-ray spectra from solid targets with various atomic numbers are characterized for a laser pulse width τ1 ~ 400 fs. With low contrast (105), the x-ray spectrum in the λ = 40-100 A ̊ spectral region is dominated by line emission, and the x-ray pulse duration is found to be characteristic of a long-scalelength, low-density plasma. Bright, picosecond, broadband emission, characteristic of a short-scale-length, high-density plasma, is produced only when a high laser contrast (1010) is used. It is demonstrated experimentally that the pulse width of laser-produced x-ray radiation may be varied down to the picosecond time scale by adjusting the incident ultrashort-pulse laser flux. The results are found to be in qualitative agreement with the predictions of both a code-independent model of radiation from a collisionally dominated two-level ion and a hydrodynamics code coupled to a detailed-configuration atomic physics model. X-ray film measurements of conversion efficiency, along with pinhole camera measurements of the emission region, reveal very high x-ray brightness.

Original languageEnglish (US)
Pages (from-to)401-411
Number of pages11
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume54
Issue number1-2
DOIs
StatePublished - Jan 1 1995

Fingerprint

X rays
pulse duration
Lasers
x ray spectra
plasma density
lasers
Laser pulses
x rays
Plasma density
pinhole cameras
laser plasma interactions
x ray lasers
atomic physics
radiation
pulses
Atomic physics
Pinhole cameras
X ray films
high power lasers
Plasma interactions

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

Cite this

Picosecond x-rays from subpicosecond-laser-produced hot-dense matter. / Umstadter, D.; Workman, J.; Maksimchuk, A.; Liu, X.; Ellenberger, U.; Coe, J. S.; Chien, C. Y.

In: Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 54, No. 1-2, 01.01.1995, p. 401-411.

Research output: Contribution to journalArticle

Umstadter, D. ; Workman, J. ; Maksimchuk, A. ; Liu, X. ; Ellenberger, U. ; Coe, J. S. ; Chien, C. Y. / Picosecond x-rays from subpicosecond-laser-produced hot-dense matter. In: Journal of Quantitative Spectroscopy and Radiative Transfer. 1995 ; Vol. 54, No. 1-2. pp. 401-411.
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