Study on anti-radiation damage effect of MgF2/Lumogen composite films
In order to investigate the characteristics of high-energy radiation damage in MgF2/Lumogen composite films used for vacuum ultraviolet detection,a 300 W high-energy continuous laser with a wavelength of 1 064 nm was employed for irradiation.By adjusting the laser power and scanning rate,the energy and duration of laser irradiation on the film were controlled,and measurements were conducted on photoluminescence intensity,fluorescence decay,and transmittance before and after irradiation.The results demonstrate that under laser irradiation with an energy density ranging from 0.58 to 2.94 W/mm2 at a scanning rate between 50 to 10 mm/min,the fluorescence response intensity upon deep ultraviolet excitation at 160 nm decreases by approximately 1%to 61%,while that upon near-ultraviolet excitation at 273 nm decreases by around 1%to 21%.Moreover,there is a decrease in visible light transmittance within the range of wavelengths from 500 to700 nm by about 2%to 3%.Based on the comparison of the radiation damage observed in single-layer Lumogen films as well as heat conduction analysis performed on composite films,it can be concluded that MgF2 film not only possesses anti-radiation damage capability but also exhibits an anti-reflection effect on Lumogen.
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