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    LASER SYSTEMS
    1.
    发明申请
    LASER SYSTEMS 审中-公开
    激光系统

    公开(公告)号：WO1992015985A1

    公开(公告)日：1992-09-17

    申请号：PCT/US1992001548

    申请日：1992-02-25

    Applicant: BATTELLE MEMORIAL INSTITUTE

    Inventor： BATTELLE MEMORIAL INSTITUTE ,  EPSTEIN, Harold, M. ,  DULANEY, Jeffrey, L. ,  SOKOL, David, W.

    IPC: G10K15/04

    CPC classification number: G10K15/046

    Abstract: Apparatus for improving properties of a solid material by providing shock waves therein. A laser oscillator (10a) provides a plurality of pulses (112) of coherent radiation. The leading edge of each pulse is sharpened either by a metal foil (18) or by phase conjugation reflection means (18a, 18e) including a stimulated Brillouin scattering cell (18d, 18e) and optionally a Faraday isolator (18b). Each pulse is directed onto an amplifier (123) comprising first and second laser amplifier rods (23a, 23b) in series. At least a major portion of the radiation (112) amplified by the first amplifier rod (23a) is directed to the second amplifier rod (23b), where it is amplified and then directed to a surface of the solid material. Substantially uniform spatial amplitude is achieved in the radiation (112) in at least one of these ways: a pair of flashlamps (70, 71) are included with each laser amplifier rod (23a, 23b) for pumping the rod; the axis of each flashlamp (70, 71) and the axis of the first rod (23a) are substantially parallel to each other and substantially in the same (first) plane; and a (second) plane containing the axis of the second rod (23b) and the parallel axes of its associated flashlamps (70, 71) is substantially perpendicular to the first plane; and/or the oscillator (10c) provides a beam of unpolarized coherent radiation (12T) in which the spatial amplitude pattern of each succeeding pulse is substantially a mirror image of the pattern in the pulse that preceded it, or is rotated about its axis by a predetermined smaller angle from the pattern in the pulse that preceded it.

    Abstract translation: 用于通过在其中提供冲击波来改善固体材料的性质的装置。 激光振荡器（10a）提供多个相干辐射的脉冲（112）。 每个脉冲的前沿通过金属箔（18）或包括受激布里渊散射单元（18d，18e）和可选的法拉第隔离器（18b）的相位共轭反射装置（18a，18e）来削尖。 每个脉冲被引导到包括串联的第一和第二激光放大器杆（23a，23b）的放大器（123）上。 由第一放大器杆（23a）放大的放射线（112）的至少主要部分被引导到第二放大器杆（23b），在该第二放大器杆（23b）被放大，然后被引导到固体材料的表面。 以这些方式中的至少一种方式在辐射（112）中实现基本均匀的空间幅度：每个用于泵送杆的激光放大器杆（23a，23b）包括一对闪光灯（70,71） 每个闪光灯（70,71）的轴线和第一杆（23a）的轴线基本上彼此平行并且基本上在相同（第一）平面中; 和包含第二杆（23b）的轴线并且其相关联的闪光灯（70,71）的平行轴线的第二平面基本上垂直于第一平面; 和/或振荡器（10c）提供非偏振相干辐射束（12T），其中每个后续脉冲的空间幅度图案基本上是其前面的脉冲中的图案的镜像，或者绕其轴线旋转 与其之前的脉冲中的图案相比预定的较小的角度。

    ROD LASERS
    2.
    发明申请
    ROD LASERS 审中-公开
    ROD激光

    公开(公告)号：WO1993005555A1

    公开(公告)日：1993-03-18

    申请号：PCT/US1992007378

    申请日：1992-08-28

    Applicant: BATTELLE MEMORIAL INSTITUTE

    Inventor： BATTELLE MEMORIAL INSTITUTE ,  EPSTEIN, Harold, M. ,  WALTERS, Craig, T. ,  DULANEY, Jeffrey, L.

    IPC: H01S03/131

    CPC classification number: H01S3/131 ,  H01S3/0404 ,  H01S3/0407 ,  H01S3/042 ,  H01S3/061 ,  H01S3/08072 ,  H01S3/0931 ,  H01S3/1022 ,  H01S3/1312

    Abstract: Atoms in a neodymium:glass rod (20) are excited to a substantially spatially uniform metastable state by flashlamps (21). A flowing fluid (26) cools the flashlamps, but not the rod; so that low temperature gradients are maintained in the rod during isothermal laser operation. Automatic control means (22) turn off the electrical power supply (24) when the temperature in the rod reaches a predetermined limit. A flowing fluid (23) then cools the rod, at a rate low enough to avoid thermal stress therein, while it is not lasing. Segments of reflectors (25) focus the pump photons in the rod so as to substantially balance the cylindrical lensing action of the rod against the radial attenuation through it, and thus to provide substantially uniform density of stored energy in the rod.

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