CAJ | 학술논문

本文中设计了一种利用软X射线双频光栅作为剪切干涉元件的剪切系统,使剪切干涉法在软X射线波段得到了应用.介绍了软X射线双频光栅的结构及衍射特性,在同步辐射光束线对双频光栅的效率分布进行了测试实验,两个剪切级次的效率比值高于75%,干扰级次效率低于5%.利用软X射线双频光栅为剪切干涉光学元件,对待测靶进行了静态检测,得到了对比度高,稳定的干涉条纹,验证了该方法在软X射线等离子体密度诊断中的可行性.
본문중설계료일충이용연X사선쌍빈광책작위전절간섭원건적전절계통,사전절간섭법재연X사선파단득도료응용.개소료연X사선쌍빈광책적결구급연사특성,재동보복사광속선대쌍빈광책적효솔분포진행료측시실험,량개전절급차적효솔비치고우75%,간우급차효솔저우5%.이용연X사선쌍빈광책위전절간섭광학원건,대대측파진행료정태검측,득도료대비도고,은정적간섭조문,험증료해방법재연X사선등리자체밀도진단중적가행성.
The M-Z interferometer with gratings or multilayer mirrors is widely used in the X-ray laser plasma diagnoses; however, this system is difficult to adjust, and results in the low success rate in experiment. Since wavefront shearing interferometers do not need a separate reference wavefront, they have inherent advantages compared with conventional interferometers. But the absence of shearing element for soft X-ray has restrained the application of the shearing interferometry in soft X-ray measurement. In this paper, a new-structured double-frequency grating was proposed and fabricated that served as the shearing element for soft X-rays, which can promote the application of shearing interferometers in the X-ray laser plasma diagnoses. The diffraction characteristics of the double-frequency grating are analyzed and tested in the synchrotron radiation beams. It is found that the intensity ratio of the two working diffracted beams is over 75%, and the intensity ratio of the rest diffracted beam to the working beam is less than 5%. An X-ray shearing interferometer using a double-frequency grating with 1000 lines/mm and 1002.5 lines/mm gratings was set up, and a clear shear interferogram was obtained. The experimental results demonstrated that the soft X-ray shearing interferometer using double-frequency grating can be applied in the X-ray laser plasma diagnoses.