Design and implementation method of spatial spectrum modulation device based on diffractive optical element

• Main Authors: JIAO BINZHANG, XIONG WEI, ZHANG MINGDUO, FAN XUHAO, GAO HUI, LIU YUNCHENG, DENG LEIMIN
• Format: Patent
• Language: Chinese; English
• Published: 22.03.2022
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention discloses a design and implementation method of a spatial spectrum modulation device based on a diffractive optical element, and belongs to the field of optical devices. The method comprises the following steps: processing a light suppression area on a substrate device of the diffractive optical element to obtain a spatial filter; determining phase distribution of the diffractive optical element, and converting the phase distribution into structural parameters of each diffractive unit; and processing the spatial filter according to the structural parameters of the diffraction units to obtain the spatial spectrum modulation device. According to the invention, a diffraction optical element with a mature processing technology is used as a main light field modulation device; and before the diffractive optical element is processed, an area with specific design parameters and distribution characteristics such as opaque or gradually-changed light transmission is processed in the center of the substrate