State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China.
Opt Lett. 2009 Dec 1;34(23):3752-4. doi: 10.1364/OL.34.003752.
We experimentally demonstrate that by use of a phase plate that is placed between an adjustable aperture and a focusing lens, the length of the filament can be dramatically extended in air with a femtosecond laser pulse. In addition, the far-field beam profile captured after the filament indicates that the supercontinuum is strongly confined on axis, and a single filament appears to be attainable at relatively high input pulse power when the phase plate is used.
我们通过实验证明，在可调孔径和聚焦透镜之间放置一个相位板，可以显著延长飞秒激光脉冲在空气中的细丝长度。此外，在细丝后捕获的远场光束轮廓表明，超连续谱在轴线上被强烈限制，并且当使用相位板时，在相对高的输入脉冲功率下似乎可以实现单个细丝。
