Modification of laser-induced fluorescence spectrum by additional azimuthal Doppler effect in optical vortex beams

• YOSHIMURA, Shinji

• TERASAKA, Kenichiro

• ARAMAKI, Mitsutoshi

Abstract

0000-0002-0602-0665

Laser-induced fluorescence (LIF) method is a powerful tool to measure flow velocities of atomic and ionic species in a plasma. Optical vortex beams, which carry orbital angular momentum of light, have a potential to expand the capability of flow velocity measurements with LIF method, because an atom moving in an optical vortex beam experiences additional Doppler effect in the azimuthal direction. The LIF spectra obtained by substituting a commonly-used plane-wave-like beam with an optical vortex beam have been numerically evaluated. It is demonstrated that modification of the spectrum can be used to detect a fast flow perpendicular to the laser path, which is impossible to be observed by conventional method in principle. The use of standard deviation of the spectrum as an index of perpendicular flow velocity is also discussed.

Journal

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 59 (SH), SHHB04-, 2020-03-05

  The Japan Society of Applied Physics

Keywords

• General Physics and Astronomy
• Physics and Astronomy (miscellaneous)
• General Engineering

Details

• CRID: 1050571948037747968
• NII Article ID: 120007176988
• NII Book ID: AA00690800
• ISSN: 00214922
• ISSN: 13474065
• DOI: 10.35848/1347-4065/ab72cb
• HANDLE: 10655/00012739
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/10762
• Web Site: https://iopscience.iop.org/article/10.35848/1347-4065/ab72cb
• Web Site: https://iopscience.iop.org/article/10.35848/1347-4065/ab72cb/pdf
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN