提升成像光谱仪入射光能利用率的研究

Research of Enhancing the Imaging Spectrometer's Incident Light Energy's Utilization Rate

针对全反射傅里叶变换成像光谱仪存在入射光能浪费的问题,对其中的菲涅尔双面镜提出了一种改进型结构,将原相连的菲涅尔双面镜分开一定距离,同时将分离后的两块平面镜各自围绕光轴向上移动适当距离,使其围绕光轴上下对称的干涉场仅在光轴的上方分布。仿真研究表明,改进后的双面镜结构可使入射光能的利用率提高一倍,同时干涉条纹傅里叶变换的分辨率提高一倍。这对提升全反射傅里叶变换成像光谱仪的弱光检测能力和拓展其光谱检测范围具有重要意义。

Pointing at the problem of the all-reflection Fourier transform spectrometer that its ability of weak light detection is wasted, we has carried a further structure on the original Fresnel double-sided mirror structure. The former coupled Fresnel double-sided mirror is separated for a distance. Meanwhile, move the two separated plane mirror up for a proper distance around the optical axis. The improved structure＇s interference field is just distributed above the optical axis which was used to around the axis of symmetry and its upper and lower was symmetry. Simulations results show that the further structure＇s incident light energy＇s utilization rate and the interference fringe Fourier transform＇s resolution are doubled. The improvement has important significance to enhance＇ the all-reflection Fourier transform imaging spectrometer＇s weak light detection capability and expand its spectrum detection range.