Electron-ion relaxation time dependent signal enhancement in ultrafast double-pulse laser-induced breakdown spectroscopy

Harilal, S. S.; Diwakar, Prasoon K.; Hassanein, A.

doi:10.1063/1.4816348

Cited by 33 publications

(16 citation statements)

References 23 publications

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“…These energies are typically used for laser-induced breakdown spectroscopy (LIBS) and other analytical approaches. 16,31 The dependence of LIBS results on pulse energies (from 10 to 100 mJ) was analyzed in a recent work. 32 This chemical analysis at the atomic level involving LIBS is very useful in a wide range of fields such as biomedical, industrial, environmental, and space applications.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of plasma expansion and shockwave formation in femtosecond laser-ablated aluminum plumes in argon gas at atmospheric pressures

et al. 2014

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Plasma expansion with shockwave formation during laser ablation of materials in a background gasses is a complex process. The spatial and temporal evolution of pressure, temperature, density, and velocity fields is needed for its complete understanding. We have studied the expansion of femtosecond (fs) laser-ablated aluminum (Al) plumes in Argon (Ar) gas at 0.5 and 1 atmosphere (atm). The expansion of the plume is investigated experimentally using shadowgraphy and fast-gated imaging. The computational fluid dynamics (CFD) modeling is also carried out. The position of the shock front measured by shadowgraphy and fast-gated imaging is then compared to that obtained from the CFD modeling. The results from the three methods are found to be in good agreement, especially during the initial stage of plasma expansion. The computed time-and spaceresolved fields of gas-dynamic parameters have provided valuable insights into the dynamics of plasma expansion and shockwave formation in fs-pulse ablated Al plumes in Ar gas at 0.5 and 1 atm. These results are compared to our previous data on nanosecond (ns) laser ablation of Al [S. S. Harilal et al., Phys. Plasmas 19, 083504 (2012)]. It is observed that both fs and ns plumes acquire a nearly spherical shape at the end of expansion in Ar gas at 1 atm. However, due to significantly lower pulse energy of the fs laser (5 mJ) compared to pulse energy of the ns laser (100 mJ) used in our studies, the values of pressure, temperature, mass density, and velocity are found to be smaller in the fs laser plume, and their time evolution occurs much faster on the same time scale. The oscillatory shock waves clearly visible in the ns plume are not observed in the internal region of the fs plume. These experimental and computational results provide a quantitative understanding of plasma expansion and shockwave formation in fs-pulse and ns-pulse laser ablated Al plumes in an ambient gas at atmospheric pressures. V

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Section: Introductionmentioning

confidence: 99%

Dynamics of plasma expansion and shockwave formation in femtosecond laser-ablated aluminum plumes in argon gas at atmospheric pressures

et al. 2014

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“…There are several studies in which its accuracy and precision are addressed (Guo et al 2013;Axente et al 2014) and some techniques, for example, Double Pulse LIBS have actually contributed in improving these aspects (Harilal, Diwakar, and Hassanein 2013;Effenberger and Scott 2010;Khalil 2013).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Single Pulse and Double Simultaneous Pulse Laser Induced Breakdown Spectroscopy

et al. 2014

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A simple and cost-effective variant of laser induced breakdown spectroscopy is presented that involves a double simultaneous pulse configuration employing a single laser source. Its performance is compared with conventional single pulse configuration. Double simultaneous pulses were accomplished by splitting a Nd:YAG laser (1064 nm, 6 ns, 360 mJ) beam into two components that were focused on the sample surface to produce two concurrent breakdowns. Experiment was repeated for single pulse and double simultaneous pulses under different ambient pressures. The performance was evaluated on the basis of self-absorption, signal-to-noise ratio (SNR), and relative standard deviation (RSD) of the Mg II doublet (280.2704 nm, 279.553 nm). Optically thin emission lines of better profiles with higher signal-to-noise ratio resulted from double simultaneous pulses. The lowest relative standard deviations obtained by single pulse and double simultaneous pulse configurations were 18.89% and 12.01%, respectively. In fact, double simultaneous pulses have performed better than single pulse in all respects within the studied regime.

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“…[12][13][14][15][16][17] Another method employed for signal enhancement is the double-pulse LIBS with a single laser system, which emerged as a promising technique due to the advantages of the signicant enhancement effect, low cost, and simplicity. [18][19][20][21] This approach has been already proposed earlier by Antony et al, where two laser pulses generated from one laser focus on the same small surface area of specimen of interest. 18 A double-pulse fs-LIBS with collinear conguration by utilizing a single laser system was reported and the enhancement factor of 4 was observed for Zn atomic lines.…”

Section: Introductionmentioning

confidence: 99%

“…18 A double-pulse fs-LIBS with collinear conguration by utilizing a single laser system was reported and the enhancement factor of 4 was observed for Zn atomic lines. 21 In addition, Piñon and Anglos carried out a comparative study of collinear double-pulse and single-pulse femtosecond LIBS on brass target. A signicant increase of the intensity and reproducibility of the optical emission signal was observed when an appropriate interpulse delay was selected.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved characteristics of laser induced breakdown spectroscopy on non-flat samples by single beam splitting

Lei

Wang

et al. 2020

RSC Adv.

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Electron-ion relaxation time dependent signal enhancement in ultrafast double-pulse laser-induced breakdown spectroscopy

Cited by 33 publications

References 23 publications

Dynamics of plasma expansion and shockwave formation in femtosecond laser-ablated aluminum plumes in argon gas at atmospheric pressures

Dynamics of plasma expansion and shockwave formation in femtosecond laser-ablated aluminum plumes in argon gas at atmospheric pressures

Comparison of Single Pulse and Double Simultaneous Pulse Laser Induced Breakdown Spectroscopy

Time-resolved characteristics of laser induced breakdown spectroscopy on non-flat samples by single beam splitting

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