Influence of distance between focusing lens and target surface on laser-induced Cu plasma temperature

Wang, Ying; Chen, Anmin; Wang, Qiuyun; Sui, Laizhi; Ke, Da; Cao, Shuai; Li, Suyu; Jiang, Yuanfei; Mu, Jin

doi:10.1063/1.5010076

Cited by 26 publications

(14 citation statements)

References 42 publications

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“…By combining spatial confinement and double-pulse, the intensity of the Cr lines has a prominent enhancement factor of 168.6 [18]. Of course, there are other methods for enhancing spectral intensity, such as magnetic fields [19], sample heating [20], and nanoparticle coating [21].…”

Section: Introductionmentioning

confidence: 99%

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Chen

Deng

et al. 2022

Advances in High Energy Physics

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To study the effects of focusing distance on the characteristics of copper plasma, a picosecond laser is utilized to ablate a pure copper plate to generate a plasma spectrum. Following numerous experiments on the subject, three significant factors are determined: lens focal length, pulse energy, and the lens-to-sample distance. These factors are employed to analyze the spectral intensity, plasma temperature, and electron density in the local thermodynamic equilibrium (LTE) and optically thin condition. Due to the shielding effects of mixed plasma, the strongest spectral intensity is achieved in the prefocused case, no matter how much beam irradiance is employed. The more intensive the beam irradiance is, the more the optimal position is distant from the focal point. The variation of plasma temperature and electron density showed a peak in the prefocused case, which is consistent with the trend of spectral intensity. For the case of extremely high irradiance (on the focus), the shielding effects become seriously, and the resultant above three factors decreased sharply. When a longer-focal-length lens is employed, the spectral intensity exhibited an obvious bimodal trend. In the prefocused case, a longer-focal-length lens is helpful to eliminate the effects of the roughness of the target surface compared with a shorter one. Finally, the assumed LTE is validated by McWhirter relation, plasma relaxation time, and diffusion length, and the optically thin condition was also validated by spectral intensity ratio. We hope that this work could be an important reference for the future design of highly optimized experiments for Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS).

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Section: Introductionmentioning

confidence: 99%

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Chen

Deng

et al. 2022

Advances in High Energy Physics

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“…We attempt to obtain the plasma temperature and electron density for supporting our propositions. We assum that the laserinduced plasma is in local thermodynamic equilibrium and optically thin, the plasma temperature is calculated by the Boltzmann plot method through using the integrated intensity of the emission line emission of copper plasma: ln(λ I/g k A ki ) = −E k /k B T e +C, [66,67] where λ is the wavelength, I the line intensity, k the upper level, i the lower level, g k the degeneracy of the upper level, A ki the transition probability, E k the energy, k B the Boltzmann constant, T e the plasma temperature, and C the constant. In order to obtain the plasma temperature, the Cu (I) 510.55-nm, 515.32-nm, and 521.82-nm lines are selected and used to calculate the plasma temperature.…”

Section: Resultsmentioning

confidence: 99%

Influence of polarization of laser beam on emission intensity of femtosecond laser-induced breakdown spectroscopy*

Yang

Liu

et al. 2020

Chinese Phys. B

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Laser-induced breakdown spectroscopy (LIBS) is an important technique which is widely used to analyze element composition. In order to improve the sensitivity of LIBS, much effort has been made to enhance the spectral intensity of LIBS by proposing a number of methods. In addition, we find that laser polarization has great influence on the emission intensity of femtosecond LIBS. By comparing the emission intensity of femtosecond LIBS in the circular polarization with that in the linear polarization, the spectral intensity in the case of circular polarization is stronger than that in the case of linear polarization. Moreover, this phenomenon is more obvious as laser energy increases. The polarization plays an important role in LIBS signal intensity. Based on the observation, the enhanced mechanism of the laser polarization for the spectral intensity is discussed in this paper, which will be helpful in spectral analysis and component analysis.

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“…Enhancements in emission intensity were observed due to this laser pulse. Thus larger the energy there was a great enhancement in intensity [43].…”

Section: Time-resolved Studiesmentioning

confidence: 96%

Analytical Approach of Laser-Induced Breakdown Spectroscopy to Detect Elemental Profile of Medicinal Plants Leaves

et al. 2019

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Laser ablation chemical and spectroscopic studies of Calotropis procera, Chenopodium ambrosioides, and Nerium indicum leaves was performed using 1064 nm Nd: YAG laser in air at different pressure and time delay. These medicinal plant’s leaves are used by local people for different diseases. The knowledge of medicinal and toxic metals in these plants is very important. We have presented time-resolved studies of different elements and how their lives change with different delay time. C, H, Si, Al, Fe, Cu, Ca, Mg, Na, K, N, O, Sr and Ba have been detected in all the three samples with a molecular form of Carbon and Nitrogen band. We have detected C, H, N, and O as a major element while, Fe, Cu, Mg, K and Ca as essential medicinal metals with other trace elements such as Si, Sr, Al and Ba in all the three plants leaves. We present 1 µs delay time is the best time for elements lifetime in time resolved studies. The behaviour of intensity with different pressures was also studied and it was concluded that 7 torr was the best pressure for the maximum value of intensity. In particular, the electron density and the temperatures of the plasma were reported. The temperature was calculated from the well-known Boltzmann plot method and electron density was estimated from the stark broadened profile of the Hα line.

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Influence of distance between focusing lens and target surface on laser-induced Cu plasma temperature

Cited by 26 publications

References 42 publications

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Influence of polarization of laser beam on emission intensity of femtosecond laser-induced breakdown spectroscopy*

Analytical Approach of Laser-Induced Breakdown Spectroscopy to Detect Elemental Profile of Medicinal Plants Leaves

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