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    • 132. 发明授权
    • Means for keeping an optical lens in a desired position in a lens holder
under varying temperature
    • 用于在变化的温度下将光学透镜保持在镜片保持器中期望位置的装置
    • US4850674A
    • 1989-07-25
    • US205687
    • 1988-06-13
    • Karl J. O. Hasselskog
    • Karl J. O. Hasselskog
    • G02B7/02
    • G02B7/028
    • An optical lens is kept in a desired position in a lens holder by a means. The back of the lens engages against a fixed abutment and the means has a tubular keeper which is threaded into the holder. The keeper is divided by slits into deflectable supports. These are kept in engagement against the peripheral surface of the lens by a ring which is a part of the means. The thickness (t) and width (b) of the supports are selected such that they are practically stiff in a tangential direction and yielding in a radial direction. To have low weight, the holder (1) and keeper (5) are of aluminum. The lens (2) is of glass and the ring (9) of titanium, the coefficient of linear expansion of which agrees closely with that of the glass. For temperature variations, the holder (1) and keeper (5) will be subjected to relatively large change in length, while the ring (9) keeps the engagement surfaces (10) of the supports (7) in engagement against the peripheral surface (8) of the lens (2 ). A diametrically opposed pair of the supports (7) then keeps the optical axis (C) of the lens in its position in the holder (1) in the tangential direction of the supports.
    • 133. 发明授权
    • Variable lens and birefringence compensator
    • 可变透镜和双折射补偿器
    • US4848881A
    • 1989-07-18
    • US011393
    • 1987-02-04
    • Osher KahanEduard Gregor
    • Osher KahanEduard Gregor
    • G02B7/02G02F1/01H01S3/00H01S3/02H01S3/08H01S3/136
    • H01S3/025G02B7/028G02F1/0147H01S3/005H01S3/136H01S3/0405H01S3/042H01S3/08072
    • Apparatus and method are disclosed for providing a variable lens and birefringence compensator (10) adapted to be used within the resonator cavity of a repetitively pulsed, variable rate, solid state laser. A cylindrical body of optical material (12) having a temperature dependent index of refraction is thermally coupled to heat exchange means (14) surrounded by potting material (16) and a heat sink (18) which adds heat to or extracts heat from the exterior surface of the cylindrical body in order to establish radially dependent thermal and stress gradients within the body. The heat exchange means is supplied power through leads (20) from the same source (22) which excites the excitation mechanism of the solid state laser. Heat is infused into or extracted from the compensator body at the same rate at which the flashtube stimulates the laser rod (24) within the laser cavity defined by resonator mirrors (26, 28). The thermal gradient is used to create a dynamic lens of opposite power to that of the laser rod which corrects beam divergence in the lased output. The stress gradient causes the compensator body to behave like a birefringent substance. The double refracting behavior of the compensator effectively reconstructs the laser beam which passes through it which was depolarized by the birefringent action of the laser rod itself.
    • 公开了用于提供可变透镜和双折射补偿器(10)的装置和方法,该可变透镜和双折射补偿器(10)适用于重复脉冲,可变速率固态激光器的谐振腔内。 具有温度依赖折射率的光学材料(12)的圆筒体与由灌封材料(16)和散热器(18)包围的热交换装置(14)热耦合,所述散热器(18)从外部加热或提取热量 以便在体内建立径向依赖的热应力梯度。 热交换装置通过来自激发固态激光器的激励机构的相同源极(22)的引线(20)供电。 热量以与谐振器镜(26,28)限定的激光腔内的闪光管刺激激光棒(24)相同的速率输入或从补偿器主体抽出。 热梯度用于产生与激光棒的功率相反的动态透镜,该透镜校正激光输出中的光束发散。 应力梯度使得补偿器主体的行为像双折射物质一样。 补偿器的双重折射行为有效地重建通过激光束本身的双折射去激发的激光束。