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X-ray Emission Hazards from Ultrashort Pulsed Laser Material Processing in an Industrial Setting

Authors :
Michael Kluge
Bernd Hoppe
Jörg Krüger
Mayka Schmitt Rahner
Jörn Bonse
Herbert Legall
Andreas Ortner
Ulf Stolzenberg
Björn Pullner
Source :
Materials, Vol 14, Iss 7163, p 7163 (2021), Materials, Materials; Volume 14; Issue 23; Pages: 7163
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

Interactions between ultrashort laser pulses with intensities larger than 1013 W/cm2 and solids during material processing can lead to the emission of X-rays with photon energies above 5 keV, causing radiation hazards to operators. A framework for inspecting X-ray emission hazards during laser material processing has yet to be developed. One requirement for conducting radiation protection inspections is using a reference scenario, i.e., laser settings and process parameters that will lead to an almost constant and high level of X-ray emissions. To study the feasibility of setting up a reference scenario in practice, ambient dose rates and photon energies were measured using traceable measurement equipment in an industrial setting at SCHOTT AG. Ultrashort pulsed (USP) lasers with a maximum average power of 220 W provided the opportunity to measure X-ray emissions at laser peak intensities of up to 3.3 × 1015 W/cm2 at pulse durations of ~1 ps. The results indicate that increasing the laser peak intensity is insufficient to generate high dose rates. The investigations were affected by various constraints which prevented measuring high ambient dose rates. In this work, a list of issues which may be encountered when performing measurements at USP-laser machines in industrial settings is identified.

Details

Language :
English
ISSN :
19961944
Volume :
14
Issue :
7163
Database :
OpenAIRE
Journal :
Materials
Accession number :
edsair.doi.dedup.....40297dcbf2e740467dbb9290d5f5a26a