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    • 7. 发明授权
    • Apparatus using induced birefringence to improve laser beam quality
    • 使用诱导双折射来提高激光束质量的装置
    • US4935932A
    • 1990-06-19
    • US232446
    • 1988-08-15
    • Bertram C. JohnsonJohn C. DiFonzoRichard L. Herbst
    • Bertram C. JohnsonJohn C. DiFonzoRichard L. Herbst
    • H01S3/08H01S3/102
    • H01S3/102H01S3/08
    • A laser beam shaper which provides polarized output with a high spatial quality, utilizing induced stress birefringence. The laser beam shaper in which light resonates along a resonant path defined by reflective surfaces includes a solid state medium, such as a Nd:YAG rod which exhibits thermally induced stress birefringence that is of known, azimuthally independent distribution in planes perpendicular to the resonant path. On either side of the medium, quarter-wave retardation plates are provided which create essentially circular polarization of the resonant light within the medium. Sandwiching the quarter-wave plates and the medium are the first and second polarizing elements, both of which are aligned along the same preferred plane. By inducing stress birefringence in the medium, an output beam is produced. A shape defined by the distribution of the birefringence is provided. With media such as YAG, the shape of the beam is round with high quality.
    • 激光束整形器,利用感应应力双折射提供具有高空间质量的偏振输出。 其中沿着由反射表面限定的谐振路径共振的激光束整形器包括固态介质,例如Nd:YAG棒,其呈现在垂直于共振路径的平面中具有已知的方位角独立分布的热致应力双折射 。 在介质的任一侧,提供四分之一波长相位差板,其产生基本上在介质内的共振光的圆偏振。 夹杂四分之一波片和介质是第一和第二偏振元件,它们都沿着相同的优选平面排列。 通过在介质中引起应力双折射,产生输出光束。 提供了由双折射分布限定的形状。 使用YAG等介质,光束的形状是高质量的圆形。