Effect of Curvature Radius Error on the Flat-Field Holographic Concave Grating Resolution and Its Compensation
KONG Peng1,2, Bayanheshig1*, LI Wen-hao1, TANG Yu-guo1, CUI Jin-jiang3
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
Abstract：The spectral resolution of the spectrometer will be seriously deteriorated by radius error which is inevitable in the flat-field holographic concave grating fabrication. In order to give theoretical guidance to the design and assembly of the spectrometers, the geometric ray-tracing method was used to calculate and analyze the variation of the spectral image width with different radius error. It was discovered that in a wide range of the radius error, the position of the tangential focal curve moves forward or backward as the radius changes, while the shape of the tangential focal curve remains almost unchanged. As is shown through the calculation，the radius error can be compensated by adjustment of the detector’s position or entrance slit distance. The simulation results indicate that with proper modification of the using structure, the grating can have a spectral resolution as good as the designed results.
孔 鹏1,2，巴音贺希格1*，李文昊1，唐玉国1，崔锦江3 . 曲率半径误差对平场全息凹面光栅分辨率的影响及其补偿方法 [J]. 光谱学与光谱分析, 2011, 31(05): 1435-1438.
KONG Peng1,2, Bayanheshig1*, LI Wen-hao1, TANG Yu-guo1, CUI Jin-jiang3 . Effect of Curvature Radius Error on the Flat-Field Holographic Concave Grating Resolution and Its Compensation . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(05): 1435-1438.
