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    • 9. 发明授权
    • Laser amplifier and method
    • 激光放大器和方法
    • US5644424A
    • 1997-07-01
    • US619275
    • 1996-03-18
    • Sterling BackusHenry C. KapteynMargaret M. Murnane
    • Sterling BackusHenry C. KapteynMargaret M. Murnane
    • H01S3/23H01S3/00
    • H01S3/2325H01S3/0057
    • Laser amplifiers and methods for amplifying a laser beam are disclosed. A representative embodiment of the amplifier comprises first and second curved mirrors, a gain medium, a third mirror, and a mask. The gain medium is situated between the first and second curved mirrors at the focal point of each curved mirror. The first curved mirror directs and focuses a laser beam to pass through the gain medium to the second curved mirror which reflects and recollimates the laser beam. The gain medium amplifies and shapes the laser beam as the laser beam passes therethough. The third mirror reflects the laser beam, reflected from the second curved mirror, so that the laser beam bypasses the gain medium and return to the first curved mirror, thereby completing a cycle of a ring traversed by the laser beam. The mask defines at least one beam-clipping aperture through which the laser beam passes during a cycle. The gain medium is pumped, preferably using a suitable pumping laser. The laser amplifier can be used to increase the energy of continuous-wave or, especially, pulsed laser beams including pulses of femtosecond duration and relatively high pulse rate.
    • 公开了用于放大激光束的激光放大器和方法。 放大器的代表性实施例包括第一和第二曲面镜,增益介质,第三镜和掩模。 增益介质位于每个弯曲镜的焦点处的第一和第二曲面镜之间。 第一曲面镜引导和聚焦激光束以将增益介质传递到第二曲面镜,该反射镜反射并重新校准激光束。 当激光束通过时,增益介质放大并成形激光束。 第三反射镜反射从第二弯曲镜反射的激光束,使得激光束绕过增益介质并返回到第一弯曲镜,从而完成由激光束穿过的环的周期。 掩模限定了至少一个光束剪切孔径,激光束在一个周期期间通过该孔径。 增益介质被泵送,优选地使用合适的泵浦激光器。 激光放大器可用于增加连续波的能量,特别是脉冲激光束,包括飞秒持续时间脉冲和相对较高的脉冲速率。