“…result of plasma spectral uctuations is consistent with previous studies. 24 The inuence of spherical aberration on the plasma temperature and electron number density was investigated. The plasma temperature was calculated using the Boltzmann plot of the N ionic spectral lines at 399.50, 444.70, 460.15, 460.72, and 480.33 nm, and the electron density was calculated using the Ha 656.28 nm.…”
Section: Discussionmentioning
confidence: 99%
“…22 Compared with changing the laser mode, the condenser lens is more exible and operable, so it became the research highlight for optimizing laser focusing. [23][24][25] Zhang et al reported that they experimentally compared the effects of plano-convex lenses of different focal lengths on the air breakdown spectrum. 23 As the focal length decreased, the spectral intensity increased and the uctuation decreased.…”
Section: Introductionmentioning
confidence: 99%
“…22 Compared with changing the laser mode, the condenser lens is more flexible and operable, so it became the research highlight for optimizing laser focusing. 23–25…”
In this work, we study the influence of energy distribution caused by spherical aberration on laser-induced air breakdown. We achieve more concentrated energy distribution using an aspheric lens with eliminated...
“…result of plasma spectral uctuations is consistent with previous studies. 24 The inuence of spherical aberration on the plasma temperature and electron number density was investigated. The plasma temperature was calculated using the Boltzmann plot of the N ionic spectral lines at 399.50, 444.70, 460.15, 460.72, and 480.33 nm, and the electron density was calculated using the Ha 656.28 nm.…”
Section: Discussionmentioning
confidence: 99%
“…22 Compared with changing the laser mode, the condenser lens is more exible and operable, so it became the research highlight for optimizing laser focusing. [23][24][25] Zhang et al reported that they experimentally compared the effects of plano-convex lenses of different focal lengths on the air breakdown spectrum. 23 As the focal length decreased, the spectral intensity increased and the uctuation decreased.…”
Section: Introductionmentioning
confidence: 99%
“…22 Compared with changing the laser mode, the condenser lens is more flexible and operable, so it became the research highlight for optimizing laser focusing. 23–25…”
In this work, we study the influence of energy distribution caused by spherical aberration on laser-induced air breakdown. We achieve more concentrated energy distribution using an aspheric lens with eliminated...
“…For example, Hou et al 12 improved the LIBS signal quality by shaping the laser beam from a commonly used Gaussian profile to a flat-top profile. Yao et al 13 reported that aberration diminished focusing shrunk the laser focal region, leading to fewer plasma position fluctuations and higher signal repeatability. Yu et al reduced the spectral fluctuations using a gas mixture of helium (He), neon (Ne), and argon (Ar) as the surrounding ambiance.…”
Large spectral fluctuations bring large errors in laser-induced breakdown spectroscopy (LIBS) analysis, which impedes the improvement of precision and accuracy, limiting the large-scale application and commercialization. In this work, we...
“…It is necessary to take measures to ensure the repeatability and stability of spectral data. Some researchers committed to reducing the probability of low quality laser breakdown by transforming and optimizing the LIBS experimental system, such as employing a conical tube, 22 dual lens, 23 short laser pulse width, 24 two-stage cyclone measurement system, 25 and other attempts. 26 However, although equipment optimization can improve the stability of measurement to a certain extent, it is still unable to avoid the generation of the invalid spectrum.…”
The inevitable unstable fluctuations of particle flow affecting the stability and repeatability of laser-material interaction which contributes to invalid spectral data are an important interference factor for unsatisfactory quantitative analysis...
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