新型光谱成像衍射器件的研究

A novel spectral device based on multiple holographic gratings is proposed. More than one volume hologram are superimposed into the common volume of photorefractive crystal or photopolymer with the method of angle-and-wavelength-multiplexing. Using the Bragg compensatory multiplexing recording technique, this device could be also recorded with only single wavelength laser. Theoretical and experimental analysis is presented and a linear discrete-type device working at sixteen wavelengths is designed and fabricated. The device has a spectral interval of 20 nm, a spectral resolution of 2 nm and a diffraction efficiency of about 10%. It is shown that this kind of device has the advantages of high diffraction efficiency, high spectral resolution, full spectral coverage, simple structure, and imaging function. This kind of device appears promising to supply high-performance instrumentation not only for diverse fields of laser spectroscopy but also for the fields of WDM and others.

. 根据耦合波理论利用布拉格选择性优化设计光谱为线性分布的消像差波分复用器件。基于单波长布拉格补偿多重存储原理，在整个谱宽范围内分解为若干消像差滤波成像单元，采用高分子光聚合物材料制作成复合型多功能器件，具有衍射效率高、像质好、适用于阵列接收、工艺简单等特点。可广泛应用于成像光谱类和其他多通道并行处理系统。