Li Ming Shian, Wu Shing Trong, Fuh Andy Ying-Guey
Institute of Electro-optical Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Opt Express. 2010 Dec 6;18(25):26300-6. doi: 10.1364/OE.18.026300.
A continuous multiple exposure diffraction grating (CMEDG) is fabricated holographically on polymer dispersed liquid crystal (PDLC) films using two-beam interference with multiple exposures. The grating is fabricated by exposing a PDLC film to 18 repeated exposure/non-exposure cycles with an angular step of ~10°/10° while it revolves a circle on a rotation stage. The structure of the sample thus formed is analyzed using a scanning electron microscope (SEM) and shows arc-ripples around the center. From the diffraction patterns of the formed grating obtained using a normally incident laser beam, some or all of the 18 recorded arc beams can be reconstructed, as determined by the probing location. Thus, it can be applied for use as a beam-vibration sensor for a laser.
一种连续多次曝光衍射光栅（CMEDG）通过双光束干涉和多次曝光以全息方式制备在聚合物分散液晶（PDLC）薄膜上。通过在旋转台上使PDLC薄膜旋转一圈的同时，以约10°/10°的角度步长进行18次重复曝光/非曝光循环来制备该光栅。使用扫描电子显微镜（SEM）对由此形成的样品结构进行分析，结果显示在中心周围有弧形波纹。从使用垂直入射激光束获得的所形成光栅的衍射图案中，根据探测位置可以重建18条记录的弧形光束中的部分或全部。因此，它可作为激光的光束振动传感器使用。
