Spatial distribution of electron temperature and ion density in laser induced ruby (Al2O3:Cr3+) plasma using Langmuir probe

Kumari, Saroj; Kushwaha, Archana; Khare, Alika

doi:10.1088/1748-0221/7/05/c05017

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…Earlier studies have shown comparable results for the electron temperatue (4.5–16 eV) and desending behaviour of the electron temperature versus probe distance. In addition, other works have shown, with a laser pulse intensity in the order of 10 9 cm −2 , the electron temperature obtained is in the range of 2–15 eV, and for the range of laser irradiances of 4–13 × 10 8 Wcm −2 , the electron temperature has been reported as 2.42–3.28 eV.…”

Section: Resultsmentioning

confidence: 53%

“…Exponential decays of the electron temperature from 16.0 to 4.5 eV with increasing distance from 5 to 80 mm, respectively, and the ion density from 1 × 10 13 to 1.6 × 10 12 cm −3 at 30 to 50 mm, respectively, have been previously observed.…”

Section: Resultsmentioning

confidence: 55%

“…The Langmuir probe current–voltage characteristics deserve a few comments on advocating the inclusion of plasma experiments in the advanced undergraduate laboratory . Furthermore, Langmuir probe as an active probe in direct contact with the plasma can obtain information about the plume velocity expansion, local charge particle density, and electron temperature at the very plasma edge, that is, expanded zone in the low‐density, low‐temperature regions . The Langmuir probe has been used as as a simple but powerful means to characterize LPP in several works in the last decade .…”

Section: Introductionmentioning

confidence: 99%

“…In another work, the time–space resolved characterization of LPP was done using the wire probe . In addition, some experiments have been performed using a planar Langmuir probe with solid targets such as copper, silver, and ruby for measuring the electron temperature and density. The temporal evolution of a laser‐blow‐off plasma has been investigated by a triple Langmuir probe …”

Section: Introductionmentioning

confidence: 99%

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Temporal and spatial evolutions of plasma produced in a nanosecond laser field characterized by langmuir probe diagnostics

Morshedian¹,

Shahverdi

2018

Contributions to Plasma Physics

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Based on the temporal and spatial evolutions of the plasma plume, the behaviour of the laser-produced plasma is studied using a wire Langmuir probe. The plasma is generated by focusing a Nd:YAG laser pulse of 30 ns pulse duration, ∼110 mJ energy, and 1064 nm wavelength) on a solid metal (steel-316) target. By conducting experiments at low pressures (1 × 10 3 -5 × 10 −5 mbar), the following results were obtained: (a) At a lower pressure, the rise time of the electron signals is reduced, but the current amplitude is increased for both ions and electrons. (b) Fitting the shock wave model of propagation to the experimental results of the plasma plume expansion within the range 1-7 mm distance from the target shows better agreement at lower pressures. (c) For both electrons and ions, the velocity of the particles exhibited plume splitting (two regimes of velocities, namely fast and slow), which is interpreted as being dominant due to the ambipolar field. In addition, at the centimetre-scale distance from the target and using the time-of-flight method, the electron and ion velocities were determined to be ∼3 × 10 7 and ∼1.2 × 10 6 cm/s, respectively. The electron temperature is in the range 2-29 eV, and the ion density is in the range 10 11 -10 13 cm −3 at milimeter to centimetre distances from the target. KEYWORDS ambipolar field, laser-produced plasma, Longmuir probe, plume splitting, time of flight INTRODUCTIONThe interactions of a nanosecond-pulse laser beam with a solid target generate non-equilibrium and highly transient plasmas.Such plasmas belong to the category of laser-produced plasmas (LPPs), which generally follow photointeractions, ablation, and collisional processes, and lead to plasma plume expansion and thermal equilibrium. The temporal and spatial plume expansion mechanism includes different processes such as shock wave formation, deceleration, diffusion, and clustering. [1,2] Characteristic parameters of the plasma plume, such as temperature and density, show strong spatial and temporal dependences as well as dependence on the laser parameters. Spatio-temporal plume characterization of the plasma requires a variety of diagnostic methods. It is worth mentioning that the investigation of plasma development can be tackled from various angles. Applying different diagnostic techniques not only provides complementary analyses but also paves the way for utilizing the potentiality of various diagnostic systems to their full capacity under different conditions. An electrical probe such as Langmuir probe offers convenience of use and accessibility, and is considered a useful tool for measuring the plasma plume expansion characteristics in highly ionized systems. Nevertheless, interpretation of data using this technique is facilitated by assuming that the probe is located in positions where the probe does not disturb the plasma particle

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temporal and spatial evolutions of plasma produced in a nanosecond laser field characterized by langmuir probe diagnostics

Morshedian¹,

Shahverdi

2018

Contributions to Plasma Physics

View full text Add to dashboard Cite

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“…Langmuir probe is used as a diagnostic tool to get insight on behavior of laser produced plasma. It is the simplest electrical probe technique used to measure the plasma parameters of low temperature laboratory plasma and also applicable to transient plasma (Dogar et al, 2011;Kumari et al, 2012;Doggett & Lunney, 2009;Hong et al, 2000;Toftmann et al, 2000). The probe tip is inserted along the length of the plasma to collect the ions and electrons effectively and tip chosen is very thin so that there is no perturbation to the plasma plume.…”

Section: Introductionmentioning

confidence: 99%

Plasma plume behavior of laser ablated cerium oxide: Effect of oxygen partial pressure

et al. 2014

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This paper describes the spatial and temporal investigation of laser ablated plasma plume of cerium oxide target using Langmuir probe. Cerium oxide target was ablated using a KrF (λ~248 nm) gas laser. Experimental studies confirmed that oxygen partial pressure of 2 × 10 −2 mbar is sufficient enough to get good quality films of cerium oxide. At this pressure, plume was diagnosed for their spatial and temporal behavior. Spatial distribution was investigated at a distance of 15 mm, 30 mm, and up to a maximum distance of 45 mm from the target, whereas temporal behavior has been recorded in the range of 0 to 50 μS with an interval of 0.5 μS. The average electron densities are found to be maximum at 30 mm from the target position and the plasma current of the laser ablated ceria is found to be maximum at 22 μS.

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Insight into the plasma oxidation process during pulsed laser deposition

Irimiciuc

Chertopalov

Bulı́ř

et al. 2021

Plasma Processes & Polymers

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The dynamics of transient plasmas generated by ns laser ablation of Ag targets under various O 2 gas pressures (10 −5 -10 Pa) were investigated by implementing angle-and time-resolved Langmuir probe (LP) analysis and space-and timeresolved optical emission spectroscopy (OES). The effects of an O 2 atmosphere on silver oxide formation and the ionic kinetics and the overall plasma energy were systematically investigated. Measurements performed in the LP floating regime revealed the presence of three-ionic structures with kinetic energies varying from 0.8 to 350 eV, which can be tailored by the addition of O 2 . The timemodulated regime of electron temperature in the 0.5-3 eV observed for pressures higher than 2 Pa of O 2 could be explained by the formation and dissociation of silver oxide molecules. The energetic balance sustains molecular oxide formation, as confirmed by OES measurements, which revealed emission signatures of AgO (B 2 Π 3/2 and X 2 Π 3/2 ) in the 350 nm (B 2 Π 3/2 ) and 460 nm (X 2 Π 3/2 ) spectral regions. Finally, thin films were deposited to understand the range of possibilities offered by pulsed laser deposition of Ag in O 2 . The morphology and atomic structure of the films were analysed for large-scale deposition. Silver oxides were detected in the films starting from 2 Pa, while at higher values, we found mixtures of different Ag x O y phases. A cauliflower-like morphology was dominant above 5 Pa of O 2 atmosphere pressures, which signals the formation of the AgO phase in the deposited film. Our results demonstrate that the properties of deposited thin films are influenced by plasma properties.

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Spatial distribution of electron temperature and ion density in laser induced ruby (Al₂O₃:Cr³⁺) plasma using Langmuir probe

Cited by 11 publications

References 15 publications

Temporal and spatial evolutions of plasma produced in a nanosecond laser field characterized by langmuir probe diagnostics

Temporal and spatial evolutions of plasma produced in a nanosecond laser field characterized by langmuir probe diagnostics

Plasma plume behavior of laser ablated cerium oxide: Effect of oxygen partial pressure

Insight into the plasma oxidation process during pulsed laser deposition

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