Abstract
Ultrashort pulse laser machining is subject to increase the processing speeds by scaling average power and pulse repetition rate, accompanied with higher dose rates of X-ray emission generated during laser–matter interaction. In particular, the X-ray energy range below 10 keV is rarely studied in a quantitative approach. We present measurements with a novel calibrated X-ray detector in the detection range of 2–20 keV and show the dependence of X-ray radiation dose rates and the spectral emissions for different laser parameters from frequently used metals, alloys, and ceramics for ultrafast laser machining. Our investigations include the dose rate dependence on various laser parameters available in ultrafast laser laboratories as well as on industrial laser systems. The measured X-ray dose rates for high repetition rate lasers with different materials definitely exceed the legal limitations in the absence of radiation shielding.
Highlights
Since the late 1960s, laser has evolved from a laboratory curiosity to a sophisticated industrial tool
We investigate the X-ray emission during ultrashort pulse laser machining of materials which are commonly used in scientific laboratories and laser-based fabrication industries
We have presented a comparison of the emitted X-ray dose rate from laser-driven plasma of several target materials, including pure metals, different alloys, and ceramics using two different ultrafast laser systems
Summary
Since the late 1960s, laser has evolved from a laboratory curiosity to a sophisticated industrial tool. Legall et al [9] measured the spectral X-ray emission and dose rates (H (0.07)) for different target materials using an ultrashort-pulse laser up to maximum peak intensity 2.6 × 1014 W/cm. Legall et al [9] measured the spectral X-ray emission and dose rates (H (0.07)) for different target materials using an ultrashort-pulse laser up to maximum peak intensity 2.6 × 1014 W/cm2 They showed that the unwanted emission of X-ray radiation during ultrashort pulse laser processing of materials in air is commonly observed. These results were confirmed by Behrens et al (2019) under similar experimental conditions [10].
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