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Title: Novel focal point multipass cell for absorption spectroscopy on small sized atmospheric pressure plasmas

Abstract

A novel focal point multipass cell (FPMPC) was developed, in which all laser beams propagate through a common focal point. It is exclusively constructed from standard optical elements. Main functional elements are two 90{sup ∘} off-axis parabolic mirrors and two retroreflectors. Up to 17 laser passes are demonstrated with a near-infrared laser beam. The number of laser passes is precisely adjustable by changing the retroreflector distance. At the focal point beams are constricted to fit through an aperture of 0.8 mm. This is shown for 11 beam passes. Moreover, the fast temporal response of the cell permits investigation of transient processes with frequencies up to 10 MHz. In order to demonstrate the applicability of the FPMPC for atmospheric pressure plasma jets, laser absorption spectroscopy on the lowest excited argon state (1s{sub 5}) was performed on a 1 MHz argon atmospheric pressure plasma jet. From the obtained optical depth profiles, the signal-to-noise ratio was deduced. It is shown that an elevation of the laser pass number results in an proportional increase of the signal-to-noise ratio making the FPMPC an appropriate tool for absorption spectroscopy on plasmas of small dimensions.

Authors:
; ;  [1]
  1. Leibniz Institute for Plasma Science and Technology e.V., Felix-Hausdorff-St. 2, 17489 Greifswald (Germany)
Publication Date:
OSTI Identifier:
22597120
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 4; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABSORPTION; ABSORPTION SPECTROSCOPY; APERTURES; ARGON; ATMOSPHERIC PRESSURE; BEAMS; DEPTH; DISTANCE; LASERS; LEVELS; LICENSES; MHZ RANGE 01-100; MIRRORS; NOISE; PLASMA JETS; PLASMA PRESSURE; SIGNALS; SIGNAL-TO-NOISE RATIO

Citation Formats

Winter, Jörn, Hänel, Mattis, and Reuter, Stephan. Novel focal point multipass cell for absorption spectroscopy on small sized atmospheric pressure plasmas. United States: N. p., 2016. Web. doi:10.1063/1.4947512.
Winter, Jörn, Hänel, Mattis, & Reuter, Stephan. Novel focal point multipass cell for absorption spectroscopy on small sized atmospheric pressure plasmas. United States. https://doi.org/10.1063/1.4947512
Winter, Jörn, Hänel, Mattis, and Reuter, Stephan. 2016. "Novel focal point multipass cell for absorption spectroscopy on small sized atmospheric pressure plasmas". United States. https://doi.org/10.1063/1.4947512.
@article{osti_22597120,
title = {Novel focal point multipass cell for absorption spectroscopy on small sized atmospheric pressure plasmas},
author = {Winter, Jörn and Hänel, Mattis and Reuter, Stephan},
abstractNote = {A novel focal point multipass cell (FPMPC) was developed, in which all laser beams propagate through a common focal point. It is exclusively constructed from standard optical elements. Main functional elements are two 90{sup ∘} off-axis parabolic mirrors and two retroreflectors. Up to 17 laser passes are demonstrated with a near-infrared laser beam. The number of laser passes is precisely adjustable by changing the retroreflector distance. At the focal point beams are constricted to fit through an aperture of 0.8 mm. This is shown for 11 beam passes. Moreover, the fast temporal response of the cell permits investigation of transient processes with frequencies up to 10 MHz. In order to demonstrate the applicability of the FPMPC for atmospheric pressure plasma jets, laser absorption spectroscopy on the lowest excited argon state (1s{sub 5}) was performed on a 1 MHz argon atmospheric pressure plasma jet. From the obtained optical depth profiles, the signal-to-noise ratio was deduced. It is shown that an elevation of the laser pass number results in an proportional increase of the signal-to-noise ratio making the FPMPC an appropriate tool for absorption spectroscopy on plasmas of small dimensions.},
doi = {10.1063/1.4947512},
url = {https://www.osti.gov/biblio/22597120}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 4,
volume = 87,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2016},
month = {Fri Apr 15 00:00:00 EDT 2016}
}