Storm M, Begishev I A, Brown R J, Guo C, Meyerhofer D D, Mileham C, Myatt J F, Nilson P M, Sangster T C, Stoeckl C, Theobald W, Zuegel J D
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.
Rev Sci Instrum. 2008 Oct;79(10):10F503. doi: 10.1063/1.2953527.
High-resolution images of the rear-surface optical emission from high-intensity (I approximately 10(19) W/cm(2)) laser illuminated metal foils have been recorded using coherent transition radiation (CTR). CTR is generated as relativistic electrons, generated in high-intensity laser-plasma interactions, exit the target's rear surface and move into vacuum. A transition radiation diagnostic (TRD) records time-integrated images in a 24 nm bandwidth window around lambda=529 nm. The optical transmission at lambda=1053 nm, the laser wavelength, is 15 orders of magnitude lower than the transmission at the wavelength of interest, lambda=527 nm. The detector is a scientific grade charge-coupled device (CCD) camera that operates with a signal-to-noise ratio of 10(3) and has a dynamic range of 10(4). The TRD has demonstrated a spatial resolution of 1.4 microm over a 1 mm field of view, limited only by the CCD pixel size.
利用相干渡越辐射（CTR）记录了高强度（I约为10¹⁹W/cm²）激光照射金属箔后表面的高分辨率光学发射图像。CTR是在高强度激光与等离子体相互作用中产生的相对论电子离开靶后表面并进入真空时产生的。一种渡越辐射诊断仪（TRD）在波长λ = 529nm附近的24nm带宽窗口内记录时间积分图像。在激光波长λ = 1053nm处的光透射率比在感兴趣波长λ = 527nm处的透射率低15个数量级。探测器是一台科学级电荷耦合器件（CCD）相机，其工作信噪比为10³，动态范围为10⁴。TRD在1mm视场内的空间分辨率已证明为1.4μm，仅受CCD像素尺寸限制。
