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Specifications and control of spatial frequency errors of components in two-beam laser static holographic exposure for pulse compression grating fabrication

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High Power Laser Science and Engineering 2024年第1期12卷 1-12页

作者： Chen Hu Songlin Wan guochang jiang Haojin Gu Yibin Zhang Yunxia Jin Shijie Liu Chengqiang Zhao Hongchao Cao Chaoyang Wei Jianda Shao Precision Optical Manufacturing and Testing Center Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences(CAS)ShanghaiChina Key Laboratory for High Power Laser Material of Chinese Academy of Sciences Shanghai Institute of Optics and Fine MechanicsCASShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina China-Russian Belt and Road Joint Laboratory on Laser Science ShanghaiChina

The large-aperture pulse compression grating(PCG) is a critical component in generating an ultra-high-intensity, ultra-short-pulse laser;however, the size of the PCG manufactured by transmission holographic exposure is limited to large-scale high-quality materials. The reflective method is a potential way for solving the size limitation, but there is still no successful precedent due to the lack of scientific specifications and advanced processing technology of exposure mirrors. In this paper, an analytical model is developed to clarify the specifications of components, and advanced processing technology is adopted to control the spatial frequency errors. Hereafter, we have successfully fabricated a multilayer dielectric grating of 200 mm × 150 mm by using an off-axis reflective exposure system with Φ300 mm. This demonstration proves that PCGs can be manufactured by using the reflection holographic exposure method and shows the potential for manufacturing the meter-level gratings used in 100 petawatt class high-power lasers.

关键词： high-power laser off-axis reflective exposure system pulse compression grating spatial frequency errors specifications

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基于计算全息图的大口径长焦距离轴抛物面反射镜测量

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中国激光 2024年第11期51卷 526-536页

作者：胡晨魏朝阳万嵩林江国昌顾昊金邵建达中国科学院上海光学精密机械研究所精密光学制造与检测中心上海201800 中国科学院上海光学精密机械研究所高功率激光材料重点实验室上海201800 中国科学院大学材料科学与光电子工程中心北京100049

随着激光脉冲宽度极限的不断突破以及峰值功率的不断提高,脉宽压缩光栅的尺寸需要进一步增大。但反射式曝光系统所需大口径长焦距离轴镜的高精度加工检测成为制约大口径光栅制作的难题。采用计算全息补偿检测不需要复杂的设计和装调,但... 详细信息

随着激光脉冲宽度极限的不断突破以及峰值功率的不断提高,脉宽压缩光栅的尺寸需要进一步增大。但反射式曝光系统所需大口径长焦距离轴镜的高精度加工检测成为制约大口径光栅制作的难题。采用计算全息补偿检测不需要复杂的设计和装调,但同样会引入非回转对称和复杂的二维投影畸变。传统的畸变校正方法由于精度受限或计算复杂不利于工程应用。提出基于数值计算的畸变校正方法,该方法具有简单通用易于编程的优点。利用800 mm口径折反镜在直径为18 m光学平台上搭建了面形检测光路,通过系统误差标定去除以及畸变校正的方法实现了高精度面形测量,经磁流变迭代加工后,面形精度RMS可收敛至0.013λ(λ=632.8 nm),这为后续大口径反射式曝光系统的建立奠定了基础。

关键词：离轴抛物面镜计算全息图误差标定投影畸变校正

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Evaluation of Component Activities in C-Mn-Fe-Si with Model Self-SReM4

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Journal of Iron and Steel Research International 1998年第1期5卷 28-33页

作者： Zhang Xiaobing jiang guochang Ding Weizhong Xu Kuangdi Shanghai Enhanced Lab of Ferrometallurgy Shanghai University

A sub-regular solution model SELFSReM4 used to evaluate activities of the components in a homogeneous region of a quaternary system has been developed in Shanghai Enhanced Lab of Ferrometallurgy. This paper introduces the application of SELFSReM4 in evaluating activities of the components in C-Mn-Fe-Si system without SiC precipitation.

关键词： sub-regular solution model component activity C-Mn-Si-Fe alloy

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ELECTROMAGNETIC CHARACTERISTICS OF LEVITATION MELTING WITH COLD CRUCIBLE

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中国有色金属学会会刊：英文版 1999年第2期9卷 183-188页

作者： Deng, Kang Zhou, Yueming Ren, Zhongming Gong, Tao jiang, guochang Shanghai Univ Shanghai China

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｉｎｇｗｉｄｅｌｙｕｓｅｄｉｎｍｅｔａｌｕｒｇｙａｎｄｎｅｗｍａｔｅｒｉａｌｓｐｒｏｃｅｓｓｉｎｇ，ｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｌｅｖｉｔａｔｉｏｎｍｅｌｔｉｎｇｗｉｔｈｃｏｌ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｉｎｇｗｉｄｅｌｙｕｓｅｄｉｎｍｅｔａｌｕｒｇｙａｎｄｎｅｗｍａｔｅｒｉａｌｓｐｒｏｃｅｓｓｉｎｇ，ｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｌｅｖｉｔａｔｉｏｎｍｅｌｔｉｎｇｗｉｔｈｃｏｌｄｃｒｕｃｉｂｌｅｉｓａｖａｌｉｄ...

关键词： cold crucibleelectromagnetic inductionlevitation meltingnumerical simulation

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Raman spectra and structure study of silicate glasses and their liquids

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Rare Metals 2006年第5期25卷 431-436页

作者： YOU Jinglin jiang guochang CHEN Hui XU Kuangdi Shanghai Enhanced Laboratory of Modem Metallurgy and Material Processing Shanghai University Shanghai 200072 China

Stress index of tetrahedron （SIT） was defined to describe the topological connectivities among various sili- con-oxygen tetrahedra （SiOT） in anionic clusters of binary silicate crystals, glasses, and melts. It was found that the value of SIT was well correlated with the wavenumber of Raman active symmetric stretching vibration of non-bridging oxygen of SiOT. The spatial fractional dimension of hyperfine structure was introduced while comparative analysis was made with the value of SIT. It can be concluded that the concepts of SIT, vibrational wavenumber, and spatial fractional dimension were inherently and holographically correlated and exhibit isomorphic representations of complex structure of binary silicates. Experimental Raman spectra of binary silicates with different alkali cations were investigated. It was demonstrated that alkali cations have little effect on the vibrational wavenumber of symmetric stretching of non-bridging oxygen （NBO） of SiOT, but remarkably affect its Raman active optical cross section, as was consensus resulted from ab initio calculation. It can also be concluded that the spatial fractional dimension of binary silicate is predominantly determined by the hyperfine structure of the anionic clusters and little affected by alkali cations, although the species of anionic clusters and their distributions were originally assigned by the content of alkali oxides. And Raman optical activity extinct effect of isolated SiOT at high basicity should be considered while being applied to quantitatively analysis.

关键词： Raman spectroscopy silicate microstructure spatial fractional dimension

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EVALUATION OF COMPONENT ACTIVITIES IN THE MOLTEN C_Fe-X(X=Si,Mn,Cr,Ni)SYSTEM

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Acta Metallurgica Sinica(English Letters) 1992年第12期5卷 476-482页

作者： jiang guochang ZHANG Xiaobing XU Kuangdi Shanghai University of Technology,Shanghai,China Shanghai Univ of Technology Shanghai China

Expressing the excess partial molar free energies and integral excess free energy as poly- nome of the composition,then the parameters in the expression of excess partial molar free energy of C were evaluated based on:the excess partial free energy of C in C-Fe bi- nary alloy:the integral excess free energy of Fe-X binary alloy:the C saturation curve and the iso-activity curve of C (α_c=0.025) in the ternary *** the activity coefficient of X was evaluated with the so-called “I-D” method,by which the component activities of every element in the whole molten ternary alloy can be evaluated,and the results are in good agreement with literature data based on experiment.

关键词： component activity coeffcient C-Fe-Si system C-Fe-Mn system C-Fe-Cr system C-Fe-Ni system

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NUMERICAL　SIMULATION　OF　ALTERNATIVE　HORIZONTAL　LEVITATION　ELECTROMAGNETIC　CONTINUOUS　CASTING（Ⅱ）

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中国有色金属学会会刊：英文版 1996年第4期6卷 42-46页

作者： Zhu Shoujun Ren Zhongming Deng Kang jiang guochang(Shanghai Enhanced Laboratory of Ferrometallurgy,Shanghai University,Shanghai 200072) Shanghai Enhanced Laboratory of Ferrometallurgy Shanghai University Shanghai 200072 China

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＡＬＴＥＲＮＡＴＩＶＥＨＯＲＩＺＯＮＴＡＬＬＥＶＩＴＡＴＩＯＮＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧ（Ⅱ）￥ＺｈｕＳｈｏｕｊｕｎ；ＲｅｎＺｈｏｎｇｍ... 详细信息

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＡＬＴＥＲＮＡＴＩＶＥＨＯＲＩＺＯＮＴＡＬＬＥＶＩＴＡＴＩＯＮＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧ（Ⅱ）￥ＺｈｕＳｈｏｕｊｕｎ；ＲｅｎＺｈｏｎｇｍｉｎｇ；ＤｅｎｇＫａｎｇ；Ｊｉａｎ...

关键词： horizontal electromagnetic continuous casting electromagnetic levitation numerical simulation

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ELECTROMAGNETIC MODEL OF LEVITATION MELTING WITH COLD CRUCIBLE

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中国有色金属学会会刊：英文版 1996年第2期6卷 12-17页

作者： Deng Kang Zhou Yueming Ren Zhongming Zhu Shoujun Wei Jihe jiang guochang(Shanghai Enhanced Laboratory of Ferrometallurgy,Shanghai University, Shanghai 200072) Shanghai Enhanced Laboratory of Ferrometallurgy Shanghai University Shanghai 200072 China

ＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＭＯＤＥＬＯＦＬＥＶＩＴＡＴＩＯＮＭＥＬＴＩＮＧＷＩＴＨＣＯＬＤＣＲＵＣＩＢＬＥＤｅｎｇＫａｎｇ；ＺｈｏｕＹｕｅｍｉｎｇ；ＲｅｎＺｈｏｎｇｍｉｎｇ；ＺｈｕＳｈｏｕｊｕｎ；ＷｅｉＪｉｈｅ；... 详细信息

ＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＭＯＤＥＬＯＦＬＥＶＩＴＡＴＩＯＮＭＥＬＴＩＮＧＷＩＴＨＣＯＬＤＣＲＵＣＩＢＬＥＤｅｎｇＫａｎｇ；ＺｈｏｕＹｕｅｍｉｎｇ；ＲｅｎＺｈｏｎｇｍｉｎｇ；ＺｈｕＳｈｏｕｊｕｎ；ＷｅｉＪｉｈｅ；ＪｉａｎｇＧｕｏｃｈａｎｇ（Ｓｈａ...

关键词： cold crucible electromagnetic induction levitation melting

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Study of aquatic chemical characteristic in some bays along the coastal region of Zhejiang Province

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Acta Oceanologica Sinica 1990年第4期9卷 547-554页

作者： Wang Yuheng,Dong Henglin and jiang guochang The Second Institute of Oceanography,State Oceanic Administration ,Hangzhou,China The Second Inst. of Oceanography State Oceanic Administration Hangzhou China. China

In this paper,the aquatic chemical characteristics in the Hangzhou Bay,Xiangshan Bay and Leqing Bay along the coastal region of Zhejiang Province are discussed . Results show that the seasonal variations of chemical elements are obvious. The distribution of silicate in Hangzhou Bay and contents of dissolved oxygen and nutrient in the Xiangshan Bay are found to be unusual in winter. Correlations among the elements are complex. The content of nutrient in the Hangzhou Bay is higher than that in Xiangshan Bay and the content of nutrient in the Xiangshan Bay is higher than that in the Leqing Bay . The variation of the ratio of N/P is obvious. This reflects the aquatic chemical characteristics in the bay. Finally, this paper also discusses the reason why the aquatic chemical characteristics in the bays are unusual.

关键词： Study of aquatic chemical characteristic in some bays along the coastal region of Zhejiang Province Bay

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Distribution of inorganic phosphate and dissolved oxygen and their relationship in the coastal upwelling area off Zhejiang

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Acta Oceanologica Sinica 1990年第3期9卷 465-472页

作者： jiang guochang and Wang YuhengSecond Institute Oceanography, State Oceanic Administration,Hangzhou, China

The change and distribution of inorganic phosphate and dissolved oxygen content in sea water pos-sess a certuin regularity and correlation, which are closely related to the direct influence of biologicalactivities. During the period of phytoplankton bloom, phosphate content may be exhausted and, at thesame time, oxygen content in sea water increases in the euphotic layer. With the decomposition of or-ganic matter, phosphate content increases and oxygen content decreases in the deeper layer. In addi-tion, the upwelling carries the "new" nutrients to the euphotic layer, which provides advantageous

关键词： Ph Distribution of inorganic phosphate and dissolved oxygen and their relationship in the coastal upwelling area off Zhejiang area

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