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VERSION:2.0
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SUMMARY:Plasma optical emission signal characterisation in Laser-Induced B
 reakdown Spectroscopy
DTSTART:20251210T140000Z
DTEND:20251210T160000Z
DTSTAMP:20260911T050533Z
UID:0ad05ce1-8985-4a41-bb4a-fd9d66e0bd1b
SEQUENCE:2
CREATED:20251202T111750Z
DESCRIPTION:The interaction of high-intensity laser pulses with a sample c
 an result in the formation of a short-lived plasma. From the deexciation o
 f the plasma\, we can extract information about the chemical composition o
 f the target using a spectrometer. This technique is known as Laser-Induce
 d Breakdown Spectroscopy (LIBS).LIBS has attracted growing attention in di
 fferent areas and applications for its ability to perform real-time\, on-s
 ite and non-destructive elemental analysis across a wide range of material
 s. Nevertheless\, its analytical performance is often limited by significa
 nt signal variability and reduced reliability.In this work\, the plasma op
 tical emission signal was successfully characterised under the influence o
 f various experimental conditions by studying their effect on signal inten
 sity and measurement variability. The analysis was conducted on a dedicate
 d test bench and is structured into two main sections: plasma generation a
 nd plasma optical emission collection. The main results showed that\, for 
 ultrashort pulse durations at pulse energies close to the breakdown thresh
 old\, the signal intensity varies linearly. Regarding the focusing conditi
 ons\, the analysis revealed the existence of two maxima\, and a slight def
 ocus was shown to improve plasma generation. Concerning signal collection\
 , an optimal magnification that maximizes the collected emission was found
 . Additionally\, the impact of the chromatic focal shift was verified and 
 the isotropic nature of the plasma emission was demonstrated.
LAST-MODIFIED:20251202T111759Z
LOCATION:Sala P3 (Piso 1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/plasma-optical-emission-si
 gnal-characterisation-in-laser-induced-breakdown-spectroscopy/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="ev0ly">The interaction of 
 high-intensity laser pulses with a sample can result in the formation of a
  short-lived plasma. From the deexciation of the plasma\, we can extract i
 nformation about the chemical composition of the target using a spectromet
 er. This technique is known as Laser-Induced Breakdown Spectroscopy (LIBS)
 .</p><p data-block-key="9iu2v">LIBS has attracted growing attention in dif
 ferent areas and applications for its ability to perform real-time\, on-si
 te and non-destructive elemental analysis across a wide range of materials
 . Nevertheless\, its analytical performance is often limited by significan
 t signal variability and reduced reliability.<br/><br/></p><p data-block-k
 ey="kt27">In this work\, the plasma optical emission signal was successful
 ly characterised under the influence of various experimental conditions by
  studying their effect on signal intensity and measurement variability. Th
 e analysis was conducted on a dedicated test bench and is structured into 
 two main sections: plasma generation and plasma optical emission collectio
 n. The main results showed that\, for ultrashort pulse durations at pulse 
 energies close to the breakdown threshold\, the signal intensity varies li
 nearly.<br/><br/> Regarding the focusing conditions\, the analysis reveale
 d the existence of two maxima\, and a slight defocus was shown to improve 
 plasma generation. Concerning signal collection\, an optimal magnification
  that maximizes the collected emission was found. Additionally\, the impac
 t of the chromatic focal shift was verified and the isotropic nature of th
 e plasma emission was demonstrated.</p>
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