高斯光束经衍射光栅的滤波特性研究

为了分析高斯光束经衍射光栅后的衍射特性,采用标量衍射理论推导出单色高斯光束的夫琅禾费衍射公式,在此基础上采用高斯光束耦合理论研究了复色高斯光束在衍射光栅的分光作用下的滤波特性,并与平行平面光束通过衍射光栅的分光特性进行了比较。结果表明,单色高斯光束在能量分布上与因子T相关,并且复色光束的滤波带宽会收窄。这为设计和优化高性能光滤波器提供了理论参考。

Optical filtering characteristics for Gaussian beam passing through of diffractive gratings

For studying the optical filtering of Gaussian beam passing through diffractive gratings, the Fraunhofer diffraction equation of Gaussian beam was deduced based on scalar diffraction theory, and then the filtering characteristics of multi-wavelength Gaussian beam was analyzed, which were compared with those of parallel plane light. It was found that the optical intensity distribution for a single wavelength Gaussian beam was related to the factor T, and the band-width for multi-wavelength Gaussian beam was narrowed. This theory is helpful for optical filter design and optimization.