Laser-based optical emission studies of barium plasma

Hanif, M.; Salik, M.; Sheikh, Nek M.; Baig, M. A.

doi:10.1007/s00340-012-5293-1

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…The plasma parameters such as electron temperature and density have been investigated as a function of various experimental variables, e.g., laser irradiance, nature, and pressure of ambient gas etc. (Shaikh et al, 2006b;Hanif et al, 2013). The optimization of these parameters helps to understand the complex ablation mechanisms and control growth of structures (Sarkar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

et al. 2014

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The effect of laser-irradiance on the surface morphology and laser induced breakdown spectroscopy of zinc has been investigated by employing Nd:YAG laser (wavelength λ = 1064 nm, pulse duration t ~ 10 ns, and repetition rate = 10 Hz) under ambient environment of argon at a pressure of 20 Torr. For this purpose, zinc targets were exposed to various laser irradiances ranging from 13 GW/cm2 to 100 GW/cm2. Scanning electron microscope analysis has been performed to analyze the surface modification of irradiated zinc targets. Scanning electron microscope analysis revealed the formation of various kinds of structures such as ripples, cones, cavities, and wave like ridges at the center and peripheral regions of ablated zinc. In the central ablated region with increasing laser irradiance, the growth of distinct and well defined ripples is observed. Further increase in irradiance makes the appearance of these ripples diffusive and narrow. In order to correlate the plasma parameters with the surface modification, laser induced breakdown spectroscopy analysis has also been performed. The electron temperature and number density of zinc plasma have been evaluated at various laser irradiances. For both plasma parameters, an increasing trend up to a certain value of laser irradiance is observed which is due to enhanced energy deposition. Afterword a decreasing trend is achieved which is attributed to the shielding effect. With further increase in irradiance a saturation stage comes and almost no change in plasma parameters is observed. This saturation is explainable on the basis of the formation of a self-regulating regime near the target surface. A strong correlation between surface modification and plasma parameters is established.

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Section: Introductionmentioning

confidence: 99%

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

et al. 2014

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“…Na I data [174] have been used for the derivation of electron density radial profiles from Stark broadening in a sodium plasma produced by laser resonance saturation [175] and for the study of the mechanisms of resonant laser ionization [176], Be II [177] data for oscillator strength ratio measurements [178], Ca I [179,180] for the determination of differential and integrated cross sections for the electron excitation of the 41Po state of calcium atom [181] and for investigation of charged particle motion in an explosively generated ionizing shock [182], Ca II [137] for chlorine detection in cement with laser-induced breakdown spectroscopy [183] and for dynamical plasma study during CaCu3Ti4O12 and Ba0.6Sr0.4TiO3 pulsed laser deposition [184], Mg I [185] and Mg II [186] for consideration of plasma plume induced during laser welding of magnesium alloys [187], Sr I [188] for investigation of vapor-phase oxidation during pulsed laser deposition of SrBi2Ta2O9. [189], for the measurement and control of ionization of the depositing flux during thin film growth [190] and for space and time resolved emission spectroscopy of Sr2FeMoO6 laser induced plasma [191], Li II [192] for examination of spatial and temporal variations of electron temperatures and densities from EUV-emitting lithium plasmas [193] and for modeling of continuous absorption of electromagnetic radiation in dense partially ionized plasmas [194], Ba I and Ba II [152,153] for investigation of plasma properties of laser-ablated strontium target [195] and for laser-based optical emission studies of barium plasma [196], Ag I [197] for determination of absolute differential cross sections for electron excitation of silver at small scattering angles [198], Cd I [199] for investigation of cadmium plasma produced by laser ablation, namely for its diagnostics [200], fo...…”

Section: Applications Of Stark Broadening Data Obtained By the Semiclmentioning

confidence: 99%

On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach

Dimitrijević

Sahal‐Bréchot

2014

Atoms

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“…The experimental setup is shown in Fig. 1, and is same as that described in our previous work (Hanif et al 2011(Hanif et al , 2013Salik et al 2011). Briefly, we used a Qswitched Nd:YAG (Quantel Brilliant) pulsed laser having pulse duration of 5 ns and 10 Hz repetition rate that is capable of delivering 400 mJ at its first harmonic (1064 nm).…”

Section: The Experimental Setupmentioning

confidence: 99%

Spectral studies of nanosecond laser interaction with magnesium sulfate target in air

et al. 2013

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The optical emission characterization of the plasma-assisted pulsed laser ablation of the magnesium sulfate target is discussed in this study. The emission spectrum produced by the magnesium sulfate plasma in the wavelength range 200-700 nm has been carefully investigated for different experimental conditions. The spectra analysis was performed by assuming the local thermodynamic equilibrium (LTE) approximation and calculating the plasma temperature with the Boltzmann plot method using neutral Mg spectral lines. The plasma temperature was obtained for different positions along the expansion axis, which allowed obtaining the electron population distribution as a function of the distance from the target. The plasma temperature along the expansion axis allowed evaluating the evolution of the excited states population when the plume expands. Moreover, the Stark broadening method has been employed for electron number density measurements. In this study, the Stark width of the Mg (I) spectral line at 285.21 nm was used. Besides, we have studied the variation of electron temperature (T e ) and electron number density (N e ) as a function of laser irradiance.

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Laser-based optical emission studies of barium plasma

Cited by 12 publications

References 25 publications

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach

Spectral studies of nanosecond laser interaction with magnesium sulfate target in air

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