X-ray emission as a potential hazard during ultrashort pulse laser material processing
| Autor: | Jörg Krüger, Günter Dittmar, Christoph Schwanke, Jörn Bonse, Herbert Legall, Simone Pentzien |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science business.industry X-ray Pulse duration General Chemistry Radiation Laser 01 natural sciences 030218 nuclear medicine & medical imaging law.invention 03 medical and health sciences Wavelength 0302 clinical medicine Optics Thin disk law 0103 physical sciences General Materials Science Radiation protection business Ultrashort pulse laser |
| Zdroj: | Applied Physics A. 124 |
| ISSN: | 1432-0630 0947-8396 |
| DOI: | 10.1007/s00339-018-1828-6 |
| Popis: | In laser machining with ultrashort laser pulses unwanted X-ray radiation in the keV range can be generated when a critical laser intensity is exceeded. Even if the emitted X-ray dose per pulse is low, high laser repetition rates can lead to an accumulation of X-ray doses beyond exposure safety limits. For 925 fs pulse duration at a center wavelength of 1030 nm, the X-ray emission was investigated up to an intensity of 2.6 × 1014 W/cm2. The experiments were performed in air with a thin disk laser at a repetition rate of 400 kHz. X-ray spectra and doses were measured for various planar target materials covering a wide range of the periodic table from aluminum to tungsten. Without radiation shielding, the measured radiation doses at this high repetition rate clearly exceed the regulatory limits. Estimations for an adequate radiation shielding are provided. |
| Databáze: | OpenAIRE |
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