光折变X射线半导体超快响应芯片空间性能的实验研究  

Experimental Study on the Spatial Performance of Photorefractive X-ray Semiconductor Ultrafast Response Chip

作　　者：谭小波 闫欣[2] 易涛[3] 何凯 邵铮铮[1] 周凯凯 高贵龙[2] 汪韬[2] 张军[1] 庄钊文[1] TAN Xiaobo;YAN Xin;YI Tao;HE Kai;SHAO Zhengzheng;ZHOU Kaikai;GAO Guilong;WANG Tao;ZHANG Jun;ZHUANG Zhaowen(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China;Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology,Xi´an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi´an 710119,China;Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China)

机构地区：[1]国防科技大学电子科学学院,长沙410073 [2]中国科学院西安光学精密机械研究所超快诊断技术重点实验室,西安710119 [3]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《光子学报》2022年第2期149-155,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(No.51302316)。

摘　　要：利用高能量纳秒激光轰击Al靶材产生的X射线作为信号源,对光折变X射线半导体响应芯片的空间性能进行实验研究。结果表明,低温生长AlGaAs芯片具备在X射线入射能量120∶1的动态范围内进行高空间分辨的大画幅成像能力,最优空间分辨率≥35 lp/mm@MTF=0.1,成像画幅可达6.7 mm×6.7 mm。该研究对于光折变X射线超快成像系统的研制具有参考意义。The traditional ultrafast electric vacuum devices are usually based on the mechanism of photoelectric conversion,and their performance is restricted by factors such as material response and space-charge effect.It is difficult for the devices like microchannel plate framing cameras,DIlation X-ray Imager(DIXI),streak cameras to achieve high temporal resolution(100 fs~1 ps)and spatial resolution(~μm)two-dimensional imaging.Ultrafast imaging technology based on photorefractive effect is a new ultrafast diagnostic technology,which has the advantages of high spatiotemporal resolution,all-optical,all-solid-state,and anti-radiation.The nonequilibrium carrier lifetime of low-temperature grown AlGaAs(LT-AlGaAs)can reach ps-level.The Ultrafast Response Chip(URC)made of LT-AlGaAs has the characteristics of high temporal resolution,meanwhile,good spatial performance is the other key factor for its application.In this paper,the spatial performance of LT-AlGaAs URC is experimentally studied using X-ray,generated by high-energy nanosecond pulsed laser-produced plasma,as the signal.The results show that the URC has the ability of high spatial resolution and large-scale imaging in the X-ray energy dynamic range of 120∶1.The optimal spatial resolution is≥35 lp/mm@MTF=0.1,and the imaging frame can reach 6.7 mm×6.7 mm.The results further verify the feasibility of ultrafast diagnostic technology based on photorefractive materials.In the future,LT-AlGaAs URC will be combined with ultrafast framing technologies such as dispersion framing and polarization chirp framing to realize multi-frames and high spatiotemporal resolution two-dimensional imaging.

关 键 词：光折变效应 X射线成像 超快成像 空间分辨率 动态范围 

分 类 号：TB872[一般工业技术—摄影技术]