Parametric study of expanding plasma plume formed by laser-blow-off of thin film using triple Langmuir probe

Abstract

The triple probe technique has been used to study the parameters of flowing plasma plume formed by laser-blow-off (LBO) of a multicomponent LiF–C target. The advantages of triple Langmuir probe over the single probe have been discussed with regard to the present study. Our results show that triple probe is better suited for parametric measurements close to the target. The spatiotemporal evolutions of electron density and temperature were measured in different ambient environments and for various laser fluences. The angular distribution of electron density and temperature was also measured. It was found that the presence of ambient gas drastically affects the electron density and temperature of the LBO plume. Large enhancement in ne and Te at intermediate pressures (10−2 Torr) is expected due to increase in collisional processes. On the other hand, laser fluence does not affect the observed ne and Te significantly. In vacuum, a new phenomenon, i.e., an oscillation in the trailing portion of the plasma plume at a closer distance from the target, is also reported.

The role of laser wavelength on plasma generation and expansion of ablation plumes in air

“…9,[16][17][18][19][20][21] Analysis of LPP can be a very challenging task considering its transient nature as well as large variations in plasma properties with space and time. There are numerous diagnostic techniques 22 that can be employed to study the characteristics of laser ablation such as shadowgraphy, 12 interferometry, 23 self-emission imaging using fast gated cameras, 20 optical emission spectroscopy (OES), 24 Langmuir probe, 25 Faraday cup, 9 etc. Each plasma diagnostic tool has its own advantages and limitations and thus comprehensive insight lies in the consolidation of information gathered from many techniques.…”

Study of High-Density Polyethylene (HDPE) Kinetics Modification Treated by Dielectric Barrier Discharge (DBD) Plasma

“…The Langmuir Triple probe is a disseminated technique for the diagnosis of plasma, which can provide the electronic temperature, i.e., the average energy of the electrons [ 56 , 57 ]. Then, it is possible to correlate the average energy of the electrons with the energy of the chemical bond, estimating the functional groups generated superficially during the plasma treatments [ 58 , 59 , 60 , 61 ].…”

Non-Linear Behaviors of Transient Periodic Plasma Dynamics in a Multifractal Paradigm

“…Relation (8) implies that the average of any non-differential component of the spatial coordinate field is null. (h) By using the scale covariant derivative, given by the operator [12,13], we can describe transient plasmas dynamics:d…”

“…Some differential procedures cannot be sued when tackling the analysis of complex processes that can imply non-linearity and chaos related to plasma dynamics [6,7]. If non-differentiability can be seen as a global property of the transient plasma [8][9][10], we can build a non-differentiable theoretical structure for describing the dynamics of the periodic phenomena in transient plasmas. Taking into account that the complexity of the interaction processes is completely substituted by non-differentiability, we are not confined by the use of the entirety of classical quantities from differentiable plasma physics.…”