We propose a super-angular aperture scheme instead of the circular aperture scheme for AOTF spectral imager to increase radiation flux of acousto-optic tunable filter (AOTF). At the same time, we quantitatively calculate the radiation flux variation caused by the super angular aperture scheme and the AOTF element response at oblique incidence. We analyze the system response of the two optical schemes and verify the simulation results through the system frequency response to compare the two AOTF optical schemes, where one is more suitable for super aperture angle imaging. We believe that the collimated optical path is more suitable for the super-angular aperture scheme because its spectral bandwidth is better than that of confocal optical scheme, and the center wavelength shift can be corrected by model or calibration.

我们为 AOTF 光谱成像仪提出了一种超角孔径方案，而不是圆形孔径方案，以增加声光可调谐滤波器 (AOTF) 的辐射通量。同时，定量计算了超角孔径方案引起的辐射通量变化和斜入射时的AOTF单元响应。我们分析了两种光学方案的系统响应，并通过系统频率响应来验证仿真结果，以比较两种AOTF光学方案，其中一种更适合超孔径角成像。我们认为准直光路更适合超角孔径方案，因为其光谱带宽优于共焦光学方案，并且中心波长偏移可以通过模型或校准进行校正。