Influence of distances between the lens and the target on the characteristic of laser induced lead plasma

Diao, Caozheng; Chen, C. S.; Man, Baoyuan; Wang, C.; Fu, Hongbo

doi:10.1140/epjd/e2011-10394-y

Cited by 10 publications

(8 citation statements)

References 20 publications

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“…In the present work, the self-reversal effects are more prominent when the target is away from the focus rather than close to the focus. The similar phenomenon of self-reversal in the emission lines has been reported by Diao et al 29 in the lead sample. They reported that when the target is behind the focus, air breakdown takes place in front of the sample surface and the laser intensity reduces at the target surface, and the more neutral lead atoms are responsible for the self-absorption.…”

Section: A Effect Of Focusing Distancesupporting

confidence: 88%

“…Plasma shielding effects in the laser ablation processes at higher laser irradiance are also reported by several groups. [29][30][31][32][33][34][35][36][37][38][39][40][41][42] D. Effect of ambient pressure Finally, the effect of ambient pressure on the emission intensities and plasma parameters has been studied. The ambient pressure was varied from 0.36 to 1000 mbar and the corresponding emission spectra were recorded at 50 mJ fixed laser energy and 0.5 mm away from the target surface.…”

Section: -4mentioning

confidence: 99%

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Infrared laser induced plasma diagnostics of silver target

2014

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In the present work, the optical emission spectra of silver (Ag) plasma have been recorded and analyzed using the laser induced breakdown spectroscopy technique. The emission line intensities and plasma parameters were investigated as a function of lens to sample distance, laser irradiance, and distance from the target surface. The electron number density (ne) and electron temperature (Te) were determined using the Stark broadened line profile and Boltzmann plot method, respectively. A gradual increase in the spectral line intensities and the plasma parameters, ne from 2.89 × 1017 to 3.92 × 1017 cm−3 and Te from 4662 to 8967 K, was observed as the laser irradiance was increased 2.29 × 1010–1.06 × 1011 W cm−2. The spatial variations in ne and Te were investigated from 0 to 5.25 mm from the target surface, yielding the electron number density from 4.78 × 1017 to 1.72 × 1017 cm−3 and electron temperature as 9869–3789 K. In addition, the emission intensities and the plasma parameters of silver were investigated by varying the ambient pressure from 0.36 to 1000 mbars.

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Section: A Effect Of Focusing Distancesupporting

confidence: 88%

Section: -4mentioning

confidence: 99%

Infrared laser induced plasma diagnostics of silver target

2014

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“…Spectral emission intensity can be affected by the distance of lens-to-sample [35]. In order to understand the influence of distance between the focusing lens and sample surface on emission intensity of LIBS, typically three distances of 91 mm, 94 mm and 98 mm were selected to compare spectra of laser-induced Si plasma, as shown in figure 2.…”

Section: Resultsmentioning

confidence: 99%

Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

Jiang¹,

Shao²,

Wang³

2018

Plasma Sci. Technol.

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Spatial confinement can significantly enhance the spectral intensity of laser-induced plasma in air. It is attributed to the compression of plasma plume by the reflected shockwave. In addition, optical emission spectroscopy of laser-induced plasma can also be affected by the distance between lens and sample surface. In order to obtain the optimized spectral intensity, the distance must be considered. In this work, spatially confined laser-induced silicon plasma by using a Nd: YAG nanosecond laser at different distances between lens and sample surface was investigated. The laser energies were 12 mJ, 16 mJ, 20 mJ, and 24 mJ. All experiments were carried out in an atmospheric environment. The results indicated that the intensity of Si (I) 390.55 nm line firstly rose and then dropped with the increase of lens-to-sample distance. Moreover, the spectral peak intensity with spatial confinement was higher than that without spatial confinement. The enhancement ratio was approximately 2 when laser energy was 24 mJ.

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“…This is because that changing the focal position is equivalent to changing the spot size, the similar spot size results in similar plasma dynamics, regardless of whether the sample surface is located in the front of the focal position or behind the focal position. 24,25 We choose one side to discuss the dynamics. For example, the left axis of the Fig.…”

Section: Resultsmentioning

confidence: 99%