量子点阵衍射光栅谱特性的数值模拟

摘要

具有单级衍射特征的量子点阵衍射光栅（QDADG ）是激光等离子体诊断的理想色散元件。本文介绍了QDADG的基本概念和制作方法，采用傅里叶光学理论模拟研究了QDADG的衍射特性。模拟结果表明，QDADG可有效抑制高级衍射，解决了传统透射光栅高级衍射带来的谱失真问题，模拟结果与实验数据符合较好。%The quantum‐dot‐array diffraction grating (QDADG ) with single order diffraction properties is a perfect dispersive element for laser plasmas diagnosis . T he basic concept and fabrication of QDADG were introduced . The numerical simulation results of QDADG were presented using Fourier optical theory .It shows that this element suppresses all of the high order diffraction ,w hich solves the key problem (dis‐tortion from high order diffraction) of the present transmission grating spectroscopy .The simulation results accord well with the experimental data .