在神光-Ⅱ激光器上开展了针孔点背光成像技术实验研究，利用第9路激光驱动平面钛靶获得4.75 keV的准单能光源，在10 μm的针孔约束下形成次级点光源对镍网格等样品成像。实验获取了清晰的网格图像，空间分辨力达到7 μm，并对烧蚀碎片、杂散光等该技术的关键性问题进行了系统深入的研究分析。实验结果表明：针孔点背光具有高空间分辨力、大视场等特点，优于传统背光技术。

Pinhole-assisted point projection (PAPP) backlight scheme is a newly developed diagnostic technique for laser-plasma experiments in foreign laboratories, which will play an important role in diagnostic experiments of inertial confinement fusion (ICF) physics. Experiments have been carried out on the additional beam of “Shenguang-Ⅱ” laser facility, to test the practicability of PAPP scheme. The K-shell X rays (～4.7 keV) emitted from laser-produced planar Ti targets pass through the pinhole aperture with diameter of 10～40 μm, then cast the shadow of the Au sample on CCD. Time-integrated two-dimensional (2D) pictures of the samples are obtained in the experiments with the resolution better than 16.1 μm. The merits, such as high resolution, large field-of-view, high contrast, have been found in the experimental results, and PAPP will become one of the most important diagnostic methods for Rayleigh-Taylor instability research, equation of state (EOS) research and so on.

针孔辅助点投影背光成像是近几年国外新兴的等离子体诊断技术,在惯性约束聚变相关物理实验诊断中具有重要的应用前景。为验证这一诊断方法的实用性,在神光Ⅱ第九路平台上开展了演示实验。利用激光驱动平面Ti靶获得约4.7 keV的Ti K壳层X射线,在十几微米的针孔约束下作为次级点源并对Au栅格样品投影成像,并用CCD记录。实验成功获得了清晰的样品二维空间分辨的时间积分图像,空间分辨力优于16.1 μm。实验结果表明针孔辅助点投影具有较高的空间分辨力、较大的视场、较高的图像对比度,将成为瑞利-泰勒不稳定性研究、激光状态方程研究等物理实验的重要诊断方法之一。

在“星光Ⅱ”装置上进行针孔点背光技术的演示实验．利用激光辐照φ50μm的小孔产生的堵孔效应使X光的脉宽缩短，起到类似于短脉冲点背光源的作用．另外利用成像方法，实验演示了由面背光方式获得点背光技术，称之为点针孔背光技术．实验结果表明：结合堵孔效应和点背光方式，能获得与点背光同样的结果，这样可以避开点背光对激光器较为苛刻的要求．