Eur. Phys. J. Appl. Phys.
Volume 71, Number 2, August 2015
The 14th International Symposium on High Pressure Low Temperature Plasma Chemistry (HAKONE XIV)
|Number of page(s)||9|
|Section||Plasma, Discharges and Processes|
|Published online||31 July 2015|
Dependence of laser-induced fluorescence on exciting-laser power: partial saturation and laser – plasma interaction*
Masaryk University, Faculty of Science, 61137
Brno, Czech Republic
a e-mail: firstname.lastname@example.org
Revised: 20 May 2015
Accepted: 1 July 2015
Published online: 31 July 2015
In recent publications on laser-induced fluorescence (LIF), the measurements are usually constricted to the region of weak exciting-laser power – the so called linear LIF. In this work, a practical formula describing the dependence of partially saturated fluorescence on the exciting-laser power is derived, together with practical implementation suggestions and comments on its limitations. In the conclusion, the practical formula is proposed with the limitation for validity β EL ≤ 0.4, where α EL is the hypothetical linear fluorescence without saturation effects, and a more general formula is derived, which is valid for higher values of α EL as well. Extending the range of exciting laser power to the region of partial saturation enhances the signal-to-noise ratio. Such measurements in a surface dielectric barrier discharge further reveal discharge disruption by photoelectrons emitted from the dielectric surface. Methods of control and solution of this problem are discussed.
© EDP Sciences, 2015
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