利用洛埃镜制作高频全息光栅的教学拓展实验

Teaching Extension Experiment of Fabricating High Frequency Holographic Grating with Lloyd Mirror

利用两束平行光的相干叠加制作全息光栅,成本低、易实现。全息光栅的制作光路多种多样,但在教学上大部分研究主要集中于低频光栅的制作。在分析大学物理实验中两种常用光路的基础上,提出利用洛埃镜光路制作高频光栅。该装置采用步进电机控制转角,有效地提高了实验精度,在制作亚波长光栅方向具有很好的应用前景,拓展了全息光栅实验的教学内容。

The holographic grating is fabricated by coherent superposition of two parallel lights,which is low in cost and easy to realize.There are various optical paths for making holographic gratings,most of the research in teaching focuses on making low-frequency gratings.Based on the analysis and comparison of two optical paths commonly used in university physics labs,this paper proposes to use high-angle gratings to create high-frequency gratings.The device uses a stepping motor to control the rotation angle,which effectively improves the experimental precision.It has a good application prospect in the fabrication of sub-wavelength grating directions,and expands the teaching content of holographic grating experiments.