The effects of the laser pulse profile on the plasma emission properties

  • Intense laser pulses create plasmas upon radiation on targets, and the properties of such plasmas are generally determined by both the properties of the target and the laser pulse. In terms of laser intensity, the irradiance and even more importantly the fluence are the critical parameters [1]. Since most lasers emit pulses of a constant pulse duration dictated by the design of the resonator and Q-switch, these two parameters are usually used interchangeably in studies. However, with the emergence of fiber laser based light sources [2], which are capable not just to freely tune the pulse duration, but to generate variable and high pulse repetition rates, up to the MHz range, a new and interesting optimization aspect is given to the laser spectroscopy community. In our study a low alloy steel standard sample (BAS 403/1) was investigated using a variable pulse duration and pulse repetition rate MOPA laser with 80W power of  = 1064 nm emission (JPT M7, VONJAN Technology GmbH, Wessling,Intense laser pulses create plasmas upon radiation on targets, and the properties of such plasmas are generally determined by both the properties of the target and the laser pulse. In terms of laser intensity, the irradiance and even more importantly the fluence are the critical parameters [1]. Since most lasers emit pulses of a constant pulse duration dictated by the design of the resonator and Q-switch, these two parameters are usually used interchangeably in studies. However, with the emergence of fiber laser based light sources [2], which are capable not just to freely tune the pulse duration, but to generate variable and high pulse repetition rates, up to the MHz range, a new and interesting optimization aspect is given to the laser spectroscopy community. In our study a low alloy steel standard sample (BAS 403/1) was investigated using a variable pulse duration and pulse repetition rate MOPA laser with 80W power of  = 1064 nm emission (JPT M7, VONJAN Technology GmbH, Wessling, Germany). In our experiments the laser was set to pulses with low individual energy (0.4 mJ) at 200 kHz pulse repetition rate, while the pulse duration was varied between 50 and 500 ns. The plasma emission was recorded by an LTB Demon spectrometer in several spectral regions, which included iron, chromium and manganese lines. Utilizing the variable pulse duration of this laser source, it was possible to assess the effects of changing the fluence, while the irradiance was kept at the same value. Among the investigated parameters are the emission intensity, peak width and self-absorption characteristics of major and minor components, as well as the plasma temperature. While the effects for the peak intensity are quite well correlated with the fluence, its interplay with other peak parameters appear to be more complicated.zeige mehrzeige weniger

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  • AMACEE poster-palasti-v9.pdf
    eng

    Poster presentation on the effects of laser pulse duration on the LIBS signal, while the fluence is kept constant. Presented at the AMACEE conference in Brno 2025

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Autor*innen:Dávid jenö Palásti
Koautor*innen:Simon Blume, Carlos Enrique Abad AndradeORCiD, Tino Seger, Jens RiedelORCiD
Dokumenttyp:Posterpräsentation
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:1 Analytische Chemie; Referenzmaterialien
1 Analytische Chemie; Referenzmaterialien / 1.3 Instrumentelle Analytik
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Chemische Verfahrenstechnik / Chemische Verfahrenstechnik
Freie Schlagwörter:Fiberlaser; LIBS; Plasma properties
Themenfelder/Aktivitätsfelder der BAM:Chemie und Prozesstechnik
Chemie und Prozesstechnik / Gefährliche Stoffe
Veranstaltung:AMACEE 2025
Veranstaltungsort:Brno, Czech Republic
Beginndatum der Veranstaltung:26.08.2025
Enddatum der Veranstaltung:28.08.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:29.09.2025
Referierte Publikation:Nein
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