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    Method and apparatus for femtosecond laser pulse measurement based on transient-grating effect
    12.
    发明授权
    Method and apparatus for femtosecond laser pulse measurement based on transient-grating effect 有权
    基于瞬态光栅效应的飞秒激光脉冲测量方法和装置

    公开(公告)号：US09488525B2

    公开(公告)日：2016-11-08

    申请号：US14466861

    申请日：2014-08-22

    申请人： Shanghai Institute of Optics And Fine Mechanics, Chinese Academy of Sciences

    发明人： Jun Liu ,  Fangjia Li ,  Ruxin Li

    IPC分类号： G01J3/28 ,  G01J3/45 ,  G01J11/00 ,  G02B19/00 ,  G02B27/09 ,  G01J3/18

    CPC分类号： G01J3/45 ,  G01J3/18 ,  G01J11/00 ,  G01J2003/1861 ,  G01J2003/451 ,  G02B19/0095 ,  G02B27/0988

    摘要： Apparatuses and method for real-time measuring ultrashort pulse shape and pulse width. Transient-grating effect on a transparent optical medium is used to generate a reference beam. A black plate with four equal-sized holes divides the incoming laser beam into four beams, one of which is attenuated and introduced an appropriate time delay relative to the other three. The four laser beams pass through a concave mirror and are focused onto a nonlinear transparent optical medium. The three beams without attenuation are used to generate a transient-grating light in the transparent medium. The transient-grating light is collinear and overlapped with the fourth attenuated beam. According to the third-order nonlinear effect, the transient-grating light has a broader spectral bandwidth and more smooth spectrum phase with respect to the incident laser. By measuring the spectral interference, the spectrum and spectral phase may be retrieved by spectral interferometry.

    摘要翻译： 用于实时测量超短脉冲形状和脉冲宽度的装置和方法。 使用透明光学介质上的瞬态光栅效应来产生参考光束。 具有四个相等尺寸孔的黑色板将入射激光束分成四个光束，其中一个光束被衰减并且相对于其他三个光束引入适当的时间延迟。 四个激光束通过凹面镜并聚焦到非线性透明光学介质上。 不使用衰减的三个光束用于在透明介质中产生瞬时光栅光。 瞬态光栅光线与第四衰减光束共线并重叠。 根据三阶非线性效应，瞬态光栅光具有相对于入射激光器的更宽的光谱带宽和更平滑的光谱相位。 通过测量光谱干涉，光谱和光谱相位可以通过光谱干涉测量来检索。

    ILLUMINATION DEVICE AND METHOD FOR USING THE SAME IN THE PROJECTION LITHOGRAPHY MACHINE
    14.
    发明申请
    ILLUMINATION DEVICE AND METHOD FOR USING THE SAME IN THE PROJECTION LITHOGRAPHY MACHINE 有权
    照相装置及其在投影计算机中的使用方法

    公开(公告)号：US20160109806A1

    公开(公告)日：2016-04-21

    申请号：US14985086

    申请日：2015-12-30

    申请人： Shanghai Institute of Optics And Fine Mechanics, Chinese Academy of Sciences

    发明人： Aijun ZENG ,  Yunbo ZHANG ,  Mingxing CHEN ,  Ying WANG ,  Huijie HUANG

    IPC分类号： G03F7/20 ,  G02B5/00 ,  G02B3/00 ,  G02B26/08 ,  G02B26/10

    CPC分类号： G03F7/702 ,  G02B3/0006 ,  G02B5/005 ,  G02B26/0833 ,  G02B26/105 ,  G03F7/70075 ,  G03F7/70116 ,  G03F7/7025

    摘要： An illumination device comprises a laser source, a beam expander, a micromirror array having a first control system, a fast steering mirror having a second control system, a diaphragm array, a microlens array, an illumination lens group, and a reflection mirror sequentially along the propagation direction of the laser beam. The first control system comprises a first computer controlling each micromirror on the micro-mirror array through the micromirror array controller to rotate in two-dimensional directions so expanded beam forms desired intensity patterns on the diaphragm array after reflected by the micromirror array and fast reflection mirror and a micromirror array controller; the second control system comprises a second computer controlling the reflection mirror of the fast steering mirror to rotate through fast steering mirror controller so created intensity pattern moves relative to the diaphragm array and a fast steering mirror controller. Method for using the illumination device is provided.

    摘要翻译： 照明装置包括激光源，光束扩展器，具有第一控制系统的微镜阵列，具有第二控制系统的快速转向镜，光阑阵列，微透镜阵列，照明透镜组和反射镜 激光束的传播方向。 第一控制系统包括第一计算机，通过微镜阵列控制器控制微镜阵列上的每个微反射镜，以在二维方向上旋转，使得扩展的光束在微镜阵列和快速反射镜反射之后在光阑阵列上形成期望的强度图案 和微镜阵列控制器; 所述第二控制系统包括控制快速转向镜的反射镜的第二计算机，以通过快速转向镜控制器旋转，从而所产生的强度图案相对于光阑阵列移动，以及快速转向镜控制器。 提供了使用照明装置的方法。

    PRISM BEAM EXPANDER ADJUSTMENT APPARATUS AND METHOD FOR ADJUSTING THE SAME
    15.
    发明申请
    PRISM BEAM EXPANDER ADJUSTMENT APPARATUS AND METHOD FOR ADJUSTING THE SAME 有权
    PRISM光束扩展器调整装置及其调整方法

    公开(公告)号：US20150085893A1

    公开(公告)日：2015-03-26

    申请号：US14556065

    申请日：2014-11-28

    申请人： Shanghai Institute of Optics And Fine Mechanics, Chinese Academy of Sciences

    发明人： Haibo Zhang ,  Zhijun Yuan ,  Jun Zhou ,  Yunrong Wei ,  Liyuan Jiang ,  Liming Geng

    IPC分类号： G02B27/62

    CPC分类号： G01B11/14 ,  G02B7/1805 ,  G02B27/62

    摘要： An apparatus and method for adjusting prism beam expander. The prism beam expander adjustment apparatus has a light source, a baseplate, a precise rotary stage, support columns, a two-dimensional slide stage, the first 90-degree bellcrank lever, an indication light source, the second 90-degree bellcrank lever, an optical filter, a photodetector, a computer, and an assembly platform. Incidence angles of all prisms of a prism beam expander can be precisely demarcated and designed beam magnification is obtained with the preferred adjustment methods. The parallel of the prisms can be guaranteed by monitoring the pitching of the prisms in the adjustment process. As a result, the linewidth narrowing and cavity losses decreasing can be improved by application of the fixed prism beam expander.

    摘要翻译： 一种用于调整棱镜扩束器的装置和方法。 棱镜扩束器调节装置具有光源，基板，精确旋转台，支柱，二维滑台，第一90度曲拐杆，指示光源，第二90度曲拐杆， 光学滤波器，光电检测器，计算机和组装平台。 可以精确划分棱镜扩束器的所有棱镜的入射角，并通过优选的调节方法获得设计的光束放大率。 通过在调整过程中监视棱镜的俯仰可以保证棱镜的平行。 结果，可以通过施加固定棱镜扩束器来改善线宽变窄和腔体损耗减小。

    METHOD AND APPARATUS FOR FEMTOSECOND LASER PULSE MEASUREMENT BASED ON TRANSIENT-GRATING EFFECT
    16.
    发明申请
    METHOD AND APPARATUS FOR FEMTOSECOND LASER PULSE MEASUREMENT BASED ON TRANSIENT-GRATING EFFECT 有权
    基于瞬态光栅效应的激光脉冲测量的方法与装置

    公开(公告)号：US20140362376A1

    公开(公告)日：2014-12-11

    申请号：US14466861

    申请日：2014-08-22

    申请人： Shanghai Institute of Optics And Fine Mechanics, Chinese Academy of Sciences

    发明人： Jun LIU ,  Fangjia LI ,  Ruxin LI

    IPC分类号： G01J3/45 ,  G01J3/18

    CPC分类号： G01J3/45 ,  G01J3/18 ,  G01J11/00 ,  G01J2003/1861 ,  G01J2003/451 ,  G02B19/0095 ,  G02B27/0988

    摘要： Apparatuses and method for real-time measuring ultrashort pulse shape and pulse width. Transient-grating effect on a transparent optical medium is used to generate a reference beam. A black plate with four equal-sized holes divides the incoming laser beam into four beams, one of which is attenuated and introduced an appropriate time delay relative to the other three. The four laser beams pass through a concave mirror and are focused onto a nonlinear transparent optical medium. The three beams without attenuation are used to generate a transient-grating light in the transparent medium. The transient-grating light is collinear and overlapped with the fourth attenuated beam. According to the third-order nonlinear effect, the transient-grating light has a broader spectral bandwidth and more smooth spectrum phase with respect to the incident laser. By measuring the spectral interference, the spectrum and spectral phase may be retrieved by spectral interferometry.

    摘要翻译： 用于实时测量超短脉冲形状和脉冲宽度的装置和方法。 使用透明光学介质上的瞬态光栅效应来产生参考光束。 具有四个相等尺寸孔的黑色板将入射激光束分成四个光束，其中一个光束被衰减并且相对于其它三个光束引入适当的时间延迟。 四个激光束通过凹面镜并聚焦到非线性透明光学介质上。 不使用衰减的三个光束用于在透明介质中产生瞬时光栅光。 瞬态光栅光线与第四衰减光束共线并重叠。 根据三阶非线性效应，瞬态光栅光具有相对于入射激光器的更宽的光谱带宽和更平滑的光谱相位。 通过测量光谱干涉，光谱和光谱相位可以通过光谱干涉测量来检索。

    DISSIMILAR METAL JOINT AND ELECTRIC RESISTANCE WELDING METHOD FOR PREPARING THE SAME
    18.
    发明公开
    DISSIMILAR METAL JOINT AND ELECTRIC RESISTANCE WELDING METHOD FOR PREPARING THE SAME 审中-公开

    公开(公告)号：US20240261887A1

    公开(公告)日：2024-08-08

    申请号：US18641316

    申请日：2024-04-19

    申请人： Shanghai Institute of Optics And Fine Mechanics, Chinese Academy of Sciences

    发明人： Mingfeng LI ,  Shanglu YANG ,  Wu TAO ,  Yanjun WANG

    IPC分类号： B23K11/11 ,  F16B5/08

    CPC分类号： B23K11/115 ,  F16B5/08

    摘要： An electric resistance welding method for a dissimilar metal joint used for welding a laminated structure, with an outer layer being composed of iron or iron-based alloy, and an inner layer being composed of a metal with a density of less than 5 g/cm3 or a melting point of lower than 800° C. The electric resistance welding method comprises an expulsion stage in which a light metal or low-melting-point metal in the middle of the laminated structure is separated in a splashing mode, so that a connecting structure is directly formed between iron or iron-based alloy layers in a welding interface to complete welding. According to the invention, the formation of brittle intermetallic compounds on the welding interface of the dissimilar joint can be avoided, thereby improving the mechanical properties of the joint and achieving reliable connection between dissimilar metals. The invention further provides a dissimilar metal joint.