Effects of laser pulse duration on the intensity of laser-induced breakdown spectroscopy and ablation morphology

Qi Yanbing; Sun Hen; Li Wenzhuo; Zhou Weidong

doi:10.11884/HPLPB202638.250177

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Qi Yanbing, Sun Hen, Li Wenzhuo, et al. Effects of laser pulse duration on the intensity of laser-induced breakdown spectroscopy and ablation morphology[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250177

Citation:

Qi Yanbing, Sun Hen, Li Wenzhuo, et al. Effects of laser pulse duration on the intensity of laser-induced breakdown spectroscopy and ablation morphology[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250177

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Effects of laser pulse duration on the intensity of laser-induced breakdown spectroscopy and ablation morphology

doi: 10.11884/HPLPB202638.250177

Qi Yanbing^{1, 2
,},
Sun Hen^{1, 2},
Li Wenzhuo^{1, 2},
Zhou Weidong^{1, 2
,
,}

1.
Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Zhejiang, Jinhua 321004, China
2.
Zhejiang Institute of Photoelectronics, Zhejiang, Jinhua 321004, China

Received Date: 2025-06-19
Accepted Date: 2025-11-25
Rev Recd Date: 2025-12-20

Available Online: 2026-01-05

Abstract

Abstract

Background
The dual-pulse LIBS (DP-LIBS) technology can effectively enhance the spectral intensity of LIBS and has received widespread attention in LIBS analysis.
Purpose
For the purpose to understand the enhancement mechanism of traditional collinear dual pulse LIBS and long-short collinear dual pulse LIBS spectra, a comparative study was conducted on two DP-LIBS with different laser excitation schemes, i.e. the conventional collinear dual nanosecond pulse excitation scheme, and the long-short collinear dual-pulse excitation scheme which combining a microsecond pulse and a nanosecond pulse.
Method
The enhancement mechanism and variation trend of spectral intensity were investigated by systematically analyzing the laser ablation morphology and LIBS spectra collected under different inter-pulse delay, spectral acquisition delay and laser pulse energy in both DP-LIBS modes.
Results
The results show that, in conventional collinear DP-LIBS, the spectral intensity increases rapidly within a short delay time of 0–2 μs, but remains relatively high in the longer delay range of 2–14 μs. And the optimal inter-pulse delay is around 4 μs in conventional collinear DP-LIBS. In contrast, the optimal inter-pulse delay for the long-short collinear DP-LIBS is approximately 25 μs, which is determined by the peak power timing of the long-pulse laser.
Conclusions
In the conventional DP-LIBS configuration, spectral enhancement is more sensitive to the energy variations of the second pulse than that of the first pulse. In the long-short pulse scheme, increasing the energy of the long-pulse laser facilitates sample heating and surface modification, thereby enhancing spectral intensity. However, excessive long-pulse laser energy might cause sample melting and material ejection, which in turn diminishes the ablation efficiency of the subsequent short-pulse laser and reduces the overall spectral intensity. Further analysis of the ablation morphology reveals that the conventional collinear DP-LIBS tends to produce deeper ablation craters, whereas the long-short collinear DP-LIBS is more likely to generate larger ablation craters.
- laser-induced breakdown spectroscopy,
- double pulse,
- pulse width

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References(20)

References

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