Cheng Ya, Sugioka Koji, Midorikawa Katsumi, Masuda Masashi, Toyoda Koichi, Kawachi Masako, Shihoyama Kazuhiko
RIKEN, The Institute of Physical and Chemical Research, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.
Opt Lett. 2003 Jan 1;28(1):55-7. doi: 10.1364/ol.28.000055.
Theoretical and experimental investigations have been made of the three-dimensional microchannel fabrication of photostructurable glass by use of a femtosecond (fs) laser. Generally, a microchannel fabricated inside glass by the scanning focal spot of a fs laser perpendicular to the direction of laser propagation assumes an elliptical shape with a cross section of large aspect ratio. We demonstrate that one can greatly reduce the aspect ratio merely by inserting a slit, which is oriented parallel to the laser's scanning direction, before the focusing lens. Computer simulations show that a more symmetrical pattern is obtained in the vicinity of the focal point with the help of such a slit, owing essentially to a diffraction effect.
利用飞秒（fs）激光对可光结构化玻璃进行三维微通道制造的理论和实验研究已经展开。一般来说，通过垂直于激光传播方向的飞秒激光扫描焦点在玻璃内部制造的微通道，其横截面呈大纵横比的椭圆形。我们证明，只需在聚焦透镜之前插入一个与激光扫描方向平行的狭缝，就可以大大降低纵横比。计算机模拟表明，借助这样一个狭缝，在焦点附近会获得更对称的图案，这主要归因于衍射效应。
