Two-photon absorption laser induced fluorescence measurements of absolute neutral deuterium density, temperature, and bulk flow in Proto-MPEX

2021 ◽  
Vol 28 (8) ◽  
pp. 082501
Author(s):  
Thomas E. Steinberger ◽  
Jacob W. McLaughlin ◽  
Theodore M. Biewer ◽  
Juan F. Caneses ◽  
Earl E. Scime
Keyword(s):  
Laser Induced Fluorescence ◽  
Bulk Flow ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Fluorescence Measurements

scholarly journals Progresses on the Use of Two-Photon Absorption Laser Induced Fluorescence (TALIF) Diagnostics for Measuring Absolute Atomic Densities in Plasmas and Flames

Plasma ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 145-171
Author(s):  
Kristaq Gazeli ◽  
Guillaume Lombardi ◽  
Xavier Aubert ◽  
Corinne Y. Duluard ◽  
Swaminathan Prasanna ◽  
...  
Keyword(s):  
Optical Transition ◽  
Thin Film Deposition ◽  
Laser Induced Fluorescence ◽  
Film Deposition ◽  
Stimulated Emission ◽  
Photon Absorption ◽  
Collisional Quenching ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Wide Range

Recent developments in plasma science and technology have opened new areas of research both for fundamental purposes (e.g., description of key physical phenomena involved in laboratory plasmas) and novel applications (material synthesis, microelectronics, thin film deposition, biomedicine, environment, flow control, to name a few). With the increasing availability of advanced optical diagnostics (fast framing imaging, gas flow visualization, emission/absorption spectroscopy, etc.), a better understanding of the physicochemical processes taking place in different electrical discharges has been achieved. In this direction, the implementation of fast (ns) and ultrafast (ps and fs) lasers has been essential for the precise determination of the electron density and temperature, the axial and radial gradients of electric fields, the gas temperature, and the absolute density of ground-state reactive atoms and molecules in non-equilibrium plasmas. For those species, the use of laser-based spectroscopy has led to their in situ quantification with high temporal and spatial resolution, with excellent sensitivity. The present review is dedicated to the advances of two-photon absorption laser induced fluorescence (TALIF) techniques for the measurement of reactive species densities (particularly atoms such as N, H and O) in a wide range of pressures in plasmas and flames. The requirements for the appropriate implementation of TALIF techniques as well as their fundamental principles are presented based on representative published works. The limitations on the density determination imposed by different factors are also discussed. These may refer to the increasing pressure of the probed medium (leading to a significant collisional quenching of excited states), and other issues originating in the high instantaneous power density of the lasers used (such as photodissociation, amplified stimulated emission, and photoionization, resulting to the saturation of the optical transition of interest).

Two-photon absorption, laser-induced fluorescence detection of Cl atoms

1982 ◽  
Vol 86 (5-6) ◽  
pp. 458-462 ◽  
Author(s):  
Michael Heaven ◽  
Terry A. Miller ◽  
Richard R. Freeman ◽  
J.C. White ◽  
Jeffrey Bokor
Keyword(s):  
Fluorescence Detection ◽  
Laser Induced Fluorescence ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Laser Induced Fluorescence Detection ◽  
Two Photon ◽  
Cl Atoms
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