MgF_(2)/Lumogen复合薄膜抗辐照损伤效应研究

Study on anti-radiation damage effect of MgF_(2)/Lumogen composite films

为研究MgF_(2)/Lumogen复合薄膜应用于真空紫外探测的高能辐照损伤特性,以300 W高能1064 nm连续激光进行辐照。通过改变激光功率和扫描速率,调控膜层受激光辐照的能量和时间,并测试辐照前后薄膜光致发光强度、荧光衰减、透过率等光信号性能。结果表明,在能量密度0.58~2.94 W/mm2、扫描速率50~10 mm/min激光辐照后,深紫外160 nm激发的荧光响应强度衰减了1%~61%,近紫外273 nm激发的荧光响应强度衰减了1%~21%,可见光500~700 nm透过率衰减了2%~3%。对比单层Lumogen薄膜的辐照损伤结果以及复合薄膜的热传导分析,MgF_(2)薄膜对Lumogen具有减反增透作用的同时还具有一定的抗辐照损伤能力。

In order to investigate the characteristics of high-energy radiation damage in MgF_(2)/Lumogen composite films used for vacuum ultraviolet detection,a 300 W high-energy continuous laser with a wavelength of 1064 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 MgF_(2) film not only possesses anti-radiation damage capability but also exhibits an anti-reflection effect on Lumogen.