Allegre O J, Jin Y, Perrie W, Ouyang J, Fearon E, Edwardson S P, Dearden G
Opt Express. 2013 Sep 9;21(18):21198-207. doi: 10.1364/OE.21.021198.
We report on new developments in wavefront and polarization control for ultrashort-pulse laser microprocessing. We use two Spatial Light Modulators in combination to structure the optical fields of a picosecond-pulse laser beam, producing vortex wavefronts and radial or azimuthal polarization states. We also carry out the first demonstration of multiple first-order beams with vortex wavefronts and radial or azimuthal polarization states, produced using Computer Generated Holograms. The beams produced are used to nano-structure a highly polished metal surface. Laser Induced Periodic Surface Structures are observed and used to directly verify the state of polarization in the focal plane and help to characterize the optical properties of the setup.
我们报告了超短脉冲激光微加工中波前和偏振控制的新进展。我们结合使用两个空间光调制器来构建皮秒脉冲激光束的光场，产生涡旋波前以及径向或方位角偏振态。我们还首次展示了利用计算机生成全息图产生的具有涡旋波前以及径向或方位角偏振态的多个一阶光束。所产生的光束用于对高度抛光的金属表面进行纳米结构化。观察到激光诱导的周期性表面结构，并用于直接验证焦平面中的偏振状态，有助于表征该装置的光学特性。
