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High-resolution spectroscopy of uranium laser-produced plasma using saturated absorption spectroscopy

Journal Article · · Spectrochimica Acta. Part B, Atomic Spectroscopy
 [1];  [2];  [3];  [4]
  1. Univ. of California, San Diego, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. Univ. of Arizona, Tucson, AZ (United States)
  3. Univ. of California, San Diego, CA (United States)
  4. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Washington State Univ., Pullman, WA (United States)
High-resolution spectroscopy of laser ablation plumes or laser-produced plasmas (LPPs) is valuable for various applications, including measuring crowded spectral features, determining spectroscopic constants, characterizing plasmas, and performing isotopic analysis. However, various line broadening mechanisms in plasmas limit its use for several applications. Here, in this study, we present the use of saturated absorption spectroscopy (SAS) for Doppler-free linewidth analysis in a uranium LPP. We demonstrate that SAS is effective in obtaining Doppler-free Lamb dip profiles with linewidths on the order of ≤ 20 MHz. The effects of saturation on the Doppler-broadened absorption and Lamb dip profiles at different pressures and probe intensities are quantified, and their impact on measurements of plasma properties is discussed. Finally, we show that the linewidths of the Lamb dips can be used for quantitative estimates of pressure and natural broadening in the plasma.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
Defense Threat Reduction Agency (DTRA); USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2569574
Report Number(s):
PNNL-SA--207891
Journal Information:
Spectrochimica Acta. Part B, Atomic Spectroscopy, Journal Name: Spectrochimica Acta. Part B, Atomic Spectroscopy Vol. 229; ISSN 0584-8547
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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