Abstract
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.
Highlights
During the past years material processing using ultra-short laser pulses has undergone a considerable development
In laser material processing with high repetition rates, the low X-ray radiation dose per pulse can accumulate over time, leading to a dose high enough to be hazardous for the operating staff
It will be shown that the dose relevant X-ray emission in laser material processing at intensities up to 2.6 × 1014 W/ cm2 with a pulse duration of 925 fs and at a wavelength of 1030 nm is restricted to an energy range below 30 keV
Summary
During the past years material processing using ultra-short laser pulses has undergone a considerable development. In laser material processing with high repetition rates, the low X-ray radiation dose per pulse can accumulate over time, leading to a dose high enough to be hazardous for the operating staff. A detailed knowledge of the emitted radiation dose and its spectral distribution is required For this purpose, the spectral X-ray emission and the generated dose in laser material processing at intensities up to 2.6 × 1014 W/cm was investigated in the present work. It will be shown that the dose relevant X-ray emission in laser material processing at intensities up to 2.6 × 1014 W/ cm with a pulse duration of 925 fs and at a wavelength of 1030 nm is restricted to an energy range below 30 keV
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
