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

A single-beam-splitting approach was used to enhance the signal intensity of LIBS under the extreme conditions of laser beam grazing of the surface of non-flat samples. Time-resolved spectra show that the laser-ablated plasma presents a stronger spectral intensity and a slower plasma decay in the sp...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2020-10, Vol.1 (65), p.39553-39561
Main Authors: Lei, Bingying, Xu, Boping, Wang, Jing, Li, Jing, Wang, Yishan, Tang, Jie, Zhao, Wei, Duan, Yixiang
Format: Article
Language:English
Subjects:
Ablation
Aluminum
Beam splitters
Chemistry
Copper
Decay rate
Delay time
Electron density
Irradiance
Laser beams
Laser induced breakdown spectroscopy
Lasers
Plasma
Plasma decay
Shielding
Spectrum analysis
Splitting
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A single-beam-splitting approach was used to enhance the signal intensity of LIBS under the extreme conditions of laser beam grazing of the surface of non-flat samples. Time-resolved spectra show that the laser-ablated plasma presents a stronger spectral intensity and a slower plasma decay in the split beam mode because of the higher laser irradiance. The temporal evolutions of signal enhancement factors indicate that the enhancement effect first rises and then drops with delay time and the maximum enhancement factor of Al plasma comes later than that of Cu plasma under the same laser energy. The mechanisms behind it are discussed. It is also found that the electron density exhibits a faster decay with delay time in the split beam mode, mainly due to the faster plasma expansion. And a slower increase of electron density with laser energy is observed in the split beam mode because of the plasma shielding effect. A single-beam-splitting approach was used to enhance the signal intensity of LIBS under the extreme condition of a laser beam grazing the surface of non-flat samples. We investigated the time-resolved characteristics of laser-induced plasma under single- and split beam modes.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra06582j