Optical Design And Prototype Of Compact VIS-IR Imaging Spectrometer For Deep Space Exploration

Deep space exploration stems from human desire to understand the universe.It is of great significance for maintaining earth security,developing cosmic resources,and promoting technological innovation.Imaging spectrometer can obtain the spatial and spectral information simultaneously,and it is an important optical payload for many deep space exploration missions.The requirements of imaging spectrometer such as light-small,wide-band and high-resolution are the key to achieve the mission of detecting the surface of distant stars.Designing and developing high-performance and compact imaging spectrometers has important research significance and application value for the development of deep space exploration.The parameters of imaging spectrometer optical system are analyzed and determined based on the application requirements and overall technical requirements.The common optical structure Offner system are designed for the dispersion system to meet the compact requirement.The visible(VIS)and infrared(IR)bands share the main mirror,convex grating and three mirror.The convex grating,which is the core element,is analyzed by considering the curve of solar radiation.The grating area and the blaze angle of each region have been optimized to achieve high efficiency for the wide band and improve the spectral response.The influence and suppression of the non-working diffraction order light for the VIS and IR channels are discussed by ray tracing.According to the design results,the prototype is developed and the parameters of the system are tested.The work in the paper establishes foundation for the design and development of compact VIS-IR imaging spectrometer for deep space exploration.