Hasegawa Satoshi, Hayasaki Yoshio
Center for Optical Research and Education (CORE), Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Japan.
Opt Express. 2013 Jun 3;21(11):12987-95. doi: 10.1364/OE.21.012987.
A parallel femtosecond pulse irradiation method using a computer-generated hologram displayed on a spatial light modulator provides the advantages of high throughput and high energy-use efficiency. Polarization control of the femtosecond pulse enables some unique properties, for example, selective excitation of an anisotropic molecule, focusing at a size beyond the diffraction limit owing to the longitudinal vector component of a radially polarized beam focused by a high-numerical-aperture objective lens, and fabrication of periodic nanostructures with femtosecond laser light. In this study, we propose a parallel femtosecond laser irradiation system with arbitrary polarization distribution control using a pair of spatial light modulators. By using the system, the interval between the diffraction spots was the closest yet reported by avoiding mutual interference among their side lobes. The interval was improved to half compared with our previous work. We also demonstrated the parallel fabrication of periodic nanostructures with orientation control, which, to our knowledge, is the first reported demonstration of its kind.
一种使用显示在空间光调制器上的计算机生成全息图的平行飞秒脉冲照射方法具有高通量和高能量利用效率的优点。飞秒脉冲的偏振控制能够实现一些独特的特性，例如，对各向异性分子的选择性激发、由于高数值孔径物镜聚焦的径向偏振光束的纵向矢量分量而实现超越衍射极限尺寸的聚焦，以及用飞秒激光制造周期性纳米结构。在本研究中，我们提出了一种使用一对空间光调制器进行任意偏振分布控制的平行飞秒激光照射系统。通过使用该系统，通过避免衍射光斑旁瓣之间的相互干扰，衍射光斑之间的间隔达到了迄今报道的最小值。与我们之前的工作相比，间隔缩短了一半。我们还展示了具有取向控制的周期性纳米结构的平行制造，据我们所知，这是首次报道此类演示。
