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SUMMARY:Plasma optical emission signal characterisation in Laser-Induced B
 reakdown Spectroscopy
DTSTART:20251210T140000Z
DTEND:20251210T160000Z
DTSTAMP:20260927T173805Z
UID:0ad05ce1-8985-4a41-bb4a-fd9d66e0bd1b
SEQUENCE:1
CREATED:20251202T111740Z
DESCRIPTION: 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 information about the chemical composition 
 of the target using a spectrometer. This technique is known as Laser-Induc
 ed Breakdown Spectroscopy (LIBS).LIBS has attracted growing attention in d
 ifferent areas and applications for its ability to perform real-time\, on-
 site and non-destructive elemental analysis across a wide range of materia
 ls. Nevertheless\, its analytical performance is often limited by signific
 ant signal variability and reduced reliability.In this work\, the plasma o
 ptical emission signal was successfully characterised under the influence 
 of various experimental conditions by studying their effect on signal inte
 nsity and measurement variability. The analysis was conducted on a dedicat
 ed test bench and is structured into two main sections: plasma generation 
 and plasma optical emission collection. The main results showed that\, for
  ultrashort pulse durations at pulse energies close to the breakdown thres
 hold\, the signal intensity varies linearly. Regarding the focusing condit
 ions\, the analysis revealed the existence of two maxima\, and a slight de
 focus was shown to improve plasma generation. Concerning signal collection
 \, an optimal magnification that maximizes the collected emission was foun
 d. Additionally\, the impact of the chromatic focal shift was verified and
  the isotropic nature of the plasma emission was demonstrated.
LAST-MODIFIED:20251202T111740Z
LOCATION:Sala P3 (Piso 1 do Pavilhão de Matemática) do IST
URL:http://df.vps.tecnico.ulisboa.pt/en/events/plasma-optical-emission-sig
 nal-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 
 information about the chemical composition of the target using a spectrome
 ter. This technique is known as Laser-Induced Breakdown Spectroscopy (LIBS
 ).</p><p data-block-key="9iu2v">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.<br/><br/></p><p data-block-
 key="kt27">In this work\, the plasma optical emission signal was successfu
 lly characterised under the influence of various experimental conditions b
 y studying their effect on signal intensity and measurement variability. T
 he analysis was conducted on a dedicated test bench and is structured into
  two main sections: plasma generation and plasma optical emission collecti
 on. The main results showed that\, for ultrashort pulse durations at pulse
  energies close to the breakdown threshold\, the signal intensity varies l
 inearly. <br/><br/>Regarding the focusing conditions\, the analysis reveal
 ed the existence of two maxima\, and a slight defocus was shown to improve
  plasma generation. Concerning signal collection\, an optimal magnificatio
 n that maximizes the collected emission was found. Additionally\, the impa
 ct of the chromatic focal shift was verified and the isotropic nature of t
 he plasma emission was demonstrated.</p>
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