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软X射线透射光栅制作技术 总被引:6,自引:0,他引:6
金透射光栅广泛用于真空紫外、X射线、物质波的衍射和光谱测量。分别介绍了美国麻省理工学院空间微结构实验室和中国科学技术大学国家同步辐射实验室的透射光栅制作技术及其新进展。麻省理工学院空间微结构实验室为完成 AXAF巨型空间天文台上的高能透射光栅谱仪经历了近 2 0年的发展 ,其光栅制作工艺日趋成熟 ,代表了当前世界最高水平。中国科学技术大学国家同步辐射实验室为了满足惯性约束核聚变实验研究的需要 ,在国内较早地开展了透射光栅的研制工作 ,在提高光栅质量的同时不断提高线密度 相似文献
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Two-Photon Fluorescence Property and Ultrafast Dynamics of Two Dipolar Compounds with Dipicolinate as Electron Acceptor 下载免费PDF全文
Linear and nonlinear photophysical properties of two novel dipolar compounds named as trans- dimethyl-4-[4'-(N,N-dimethylamino)-styry1]-pyridin-2,6-dicarboxylate (Xiao-1) and trans-dimethyl-4-[4'-(N,N-diphenylamino)-styry1]-pyridin-2,6-dicarboxylate (Xiao-2) are investigated by steady-state absorption and fluorescence spectroscopy, Z-scan and two-photon excited fluorescence measurements. Strong two-photon fluorescence emission and the pronounced positive solvatochromism are observed from two compounds. The two-photon absorption cross section of Xiao-2 is about 1.5 times larger than that of Xiao-1. One-color and two-color femtosecond pump-probe experiments are employed to investigate the excited state dynamics of two compounds. The relaxation lifetime of the intra-molecular charge transfer state is determined to be in the hundreds of picosecond domain for both the compounds in THF, and several tens of picosecond in DMSO solutions. 相似文献
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有机双光子吸收材料在高速光通讯、光信息处理和光电子学等这些领域中的应用前景得到越来越广泛的重视.为了达到实用化的目标,材料的高非线性光学活性、热稳定性及透明性等性能还必须进一步综合优化[1]. 相似文献
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