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    • 2. 发明授权
    • Multi-pass light amplifier
    • 多通道光放大器
    • US5615043A
    • 1997-03-25
    • US979576
    • 1993-05-07
    • Henry PlaessmannWilliam M. Grossman
    • Henry PlaessmannWilliam M. Grossman
    • H01S3/0941H01S3/23H01S3/081H01S3/0933
    • H01S3/2325H01S3/005H01S3/08068H01S3/09415
    • A multiple-pass laser amplifier that uses optical focusing between subsequent passes through a single gain medium so that a reproducibly stable beam size is achieved within the gain region. A confocal resonator or White Cell resonator is provided, including two or three curvilinearly shaped mirrors facing each other along a resonator axis and an optical gain medium positioned on the resonator axis between the mirrors (confocal resonator) or adjacent to one of the mirrors (White Cell). In a first embodiment, two mirrors, which may include adjacent lenses, are configured so that a light beam passing through the gain medium and incident on the first mirror is reflected by that mirror toward the second mirror in a direction approximately parallel to the resonator axis. A light beam translator, such as an optical flat of transparent material, is positioned to translate this light beam by a controllable amount toward or away from the resonator axis for each pass of the light beam through the translator. The optical gain medium may be solid-state, liquid or gaseous medium and may be pumped longitudinally or transversely. In a second embodiment, first and second mirrors face a third mirror in a White Cell configuration, and the optical gain medium is positioned at or adjacent to one of the mirrors. Defocusing means and optical gain medium cooling means are optionally provided with either embodiment, to controllably defocus the light beam, to cool the optical gain medium and to suppress thermal lensing in the gain medium.
    • 一种多遍激光放大器,其在后续通过单个增益介质之间使用光学聚焦,使得在增益区域内实现可再现的稳定的光束尺寸。 提供共焦共振器或白电池谐振器,包括沿着谐振器轴线彼此面对的两个或三个曲线形状的反射镜和位于反射镜之间的谐振器轴上的光学增益介质(共焦共振器)或与其中一个反射镜相邻(白色 细胞)。 在第一实施例中,可以包括相邻透镜的两个反射镜被配置为使得通过增益介质并且入射在第一反射镜上的入射到第一反射镜的光束被反射镜朝向第二反射镜在大致平行于谐振器轴的方向上反射 。 定位光束平移器,例如透明材料的光学平面,以使光束通过可调量量朝向或远离谐振器轴线移动,以使光束通过翻译器的每次通过。 光学增益介质可以是固态,液态或气态介质,并且可以纵向或横向泵送。 在第二实施例中,第一和第二反射镜面对白色单元配置中的第三反射镜,并且光学增益介质位于或邻近其中一个反射镜。 散焦装置和光学增益介质冷却装置可选地设置有任一实施例,以可控地散焦光束,冷却光学增益介质并抑制增益介质中的热透镜。
    • 3. 发明授权
    • Multi-pass light amplifier
    • US5546222A
    • 1996-08-13
    • US79640
    • 1993-06-18
    • Henry PlaessmannWilliam M. GrossmanTodd E. Olson
    • Henry PlaessmannWilliam M. GrossmanTodd E. Olson
    • H01S3/23H01S5/40H01S5/50H01S3/091H01S3/08
    • H01S3/2325H01S3/005H01S3/08068H01S3/09415H01S5/4025H01S5/5018
    • A multiple-pass laser amplifier that uses optical focusing between subsequent passes through a single gain medium so that a reproducibly stable beam size is achieved within the gain region. A resonator or a White Cell cavity is provided, including two or more mirrors (planar or curvilinearly shaped) facing each other along a resonator axis and an optical gain medium positioned on a resonator axis between the mirrors or adjacent to one of the mirrors. In a first embodiment, two curvilinear mirrors, which may include adjacent lenses, are configured so that a light beam passing through the gain medium and incident on the first mirror is reflected by that mirror toward the second mirror in a direction approximately parallel to the resonator axis. A light beam translator, such as an optical flat of transparent material, is positioned to translate this light beam by a controllable amount toward or away from the resonator axis for each pass of the light beam through the translator. A second embodiment uses two curvilinear mirrors and one planar mirror, with a gain medium positioned in the optical path between each curvilinear mirror and the planar mirror. A third embodiment uses two curvilinear mirrors and two planar mirrors, with a gain medium positioned adjacent to a planar mirror. A fourth embodiment uses a curvilinear mirror and three planar mirrors, with a gain medium positioned adjacent to a planar mirror. A fourth embodiment uses four planar mirrors and a focusing lens system, with a gain medium positioned between the four mirrors. A fifth embodiment uses first and second planar mirrors, a focusing lens system and a third mirror that may be planar or curvilinear, with a gain medium positioned adjacent to the third mirror. A sixth embodiment uses two planar mirrors and a curvilinear mirror and a fourth mirror that may be planar or curvilinear, with a gain medium positioned adjacent to the fourth mirror. In a seventh embodiment, first and second mirrors face a third mirror, all curvilinear, in a White Cell configuration, and a gain medium is positioned adjacent to one of the mirrors.