Effects of ambient pressure and laser fluence on the temporal evolution of 426.7 nm CII line in laser-blow-off of multilayered LiF-C thin film

Kumar, Ajai; Singh, Raghvendra; Subramanian, K. P.; Patel, Bhavesh; Sunil, S.; Prajapati, I A

doi:10.1088/0022-3727/39/22/018

Cited by 20 publications

(20 citation statements)

References 35 publications

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“…4,6 Only the main features and additional parts of the setup are summarized here. In order to study the plume propagation dynamics for close and far distances from the target and the effect of electrical probe on the characteristic plume expansion, our present experimental setup is equipped with both TLP assembly and time and space resolved OES diagnostics.…”

Section: Methodsmentioning

confidence: 99%

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

Kumar¹,

Singh²,

Thomas³

et al. 2009

Journal of Applied Physics

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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.

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Section: Methodsmentioning

confidence: 99%

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

Kumar¹,

Singh²,

Thomas³

et al. 2009

Journal of Applied Physics

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“…A detailed description of experimental setup has been reported in our previous papers [8,9]. Only the main features and additional part of the setup are summarized here.…”

Section: Methodsmentioning

confidence: 99%

“…The optical emission spectroscopic technique of LBO plume [8][9][10] has revealed that expansion feature of plume is highly dependent on the experimental conditions and varies according to the ambient environment and laser fluence. But this technique cannot provide information regarding the influence of experimental parameters on the structure of the plasma plume.…”

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confidence: 99%

Effect of ambient gas on the expansion dynamics of plasma plume formed by laser blow off of thin film

et al. 2009

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A study has been carried out to understand the influence of ambient gases on the dynamics of laser-blowoff plumes of multi-layered LiF-C thin film. Plume images at various time intervals ranging from 100 to 3000 ns have been recorded using an intensified CCD camera. Enhancement in the plume intensity and change in size and shape occurs on introducing ambient gases and these changes are highly dependent on the nature and composition of the ambient gas used. Velocity of the plume was found to be higher in helium ambient whereas intensity enhancement is greater in argon environment. The plume shapes have maximum size at 10 −2 and 10 −1 Torr of Ar and He pressures, respectively. As the background pressure increases further (>10 −2 Torr: depending on the nature of gas), the plume gets compressed/focused in the lateral direction. Internal structure formation and turbulences are observed at higher pressures (>10 −1 Torr) in both ambient gases.

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“…The present experimental setup is similar to the one described in our recent papers. 15,17 Only the main features and additional part of the setup are summarized here.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of LBO, plasma plume ͑Li͒ consists of mainly neutral and singly ionized atoms 5,[12][13][14][15] and hence recombination processes could lead to the enhancement of neutral emission lines. Therefore, it is interesting to see behavior of LBO generated species ͑specially neutral species͒ in the presence of transverse magnetic field.…”

Section: Introductionmentioning

confidence: 99%

An experimental setup to study the expansion dynamics of laser blow-off plasma plume in variable transverse magnetic field

Kumar

Chaudhari

Patel

et al. 2009

Review of Scientific Instruments

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In the present work we report generation of uniform and variable pulsed magnetic field in synchronization with pulsed plasma for the study of the expansion dynamics of laser blow-off (LBO) plasma plume. The experimental procedure for optimizing various parameters of the setup, e.g., the production of pulsed field and its synchronization with pulsed plasma and diagnostics system, is also reported. Until now the effect of magnetic field was studied using fixed field. The present setup, however, provides variable and uniform field in synchronization with the setup. A low cost time sequencing control module has been developed for the above purpose. Although the main emphasis is on the technical aspect of the setup, salient features of the effect of transverse magnetic field on the evolution features of the neutral and ionic species are also reported briefly. It is observed that LBO generated plume have a stronger correlation with the magnetic field in comparison to the conventional laser produced plasma experiments as reported earlier.

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Effects of ambient pressure and laser fluence on the temporal evolution of 426.7 nm CII line in laser-blow-off of multilayered LiF-C thin film

Cited by 20 publications

References 35 publications

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

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

Effect of ambient gas on the expansion dynamics of plasma plume formed by laser blow off of thin film

An experimental setup to study the expansion dynamics of laser blow-off plasma plume in variable transverse magnetic field

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