A tomography device based on a conventional laboratory x ray source, polycapillary parallel x ray lens (PPXRL), and polycapillary collimating x ray lens (PCXRL) is designed. The PPXRL can collect the divergent x ray beam from the source and focus it into
本文用一块Ronchi栅将待处理物进行一次曝光,根据编码片“透过率高处光栅调制度反而低”的特性,当只让光栅零级和一级处的频谱通过时,分别得到正、负像,从而实现了对比度反转.再进行颜色滤波,即可实现假彩色密度编码.
研制出具有20μm间隙的微带型Cr:GaAsps光电闸门.用锁模氩离子激光器同步泵浦的染料激光器照射,用上升时间30ps取样示波器监测,得到输出电脉冲120ps的上升时间和230ps的半极大全宽度(FWHM).在30V直流偏压下,38pJ~320pJ激光脉冲能量范围内,给出输出电脉冲峰压与光脉冲能量之间的线性关系实验曲线.
Porous materials have many applications for laser–matter interaction experiments related to inertial confinement fusion. Obtaining new knowledge about the properties of the laser-produced plasma of porous media is a challenging task. In this work, we repo
4H-SiC/SiO2nanowires are synthesized and the temperature-dependent photoluminescence (PL) properties of the nanowires are studied. Their structure and chemical composition are studied by scanning electron microscopy (SEM), transmission electron
提出了用马赫-陈德尔干涉仪和端面干涉仪的组合测量板条激光器中工作物质温度分布的原理和方法,实验验证了激光介质内部非均匀发热的理论模型。
The films of few-layer graphene are formed through laser exfoliation of a highly ordered pyrolytic graphite (HOPG), without a catalytic layer for the growth process. The femtosecond (fs) laser exfoliation process is investigated at different laser fluence