Using the tradeoff optimization of the application requirement and the available technology

an optimized optical system was introduced to design a new type of imaging spectrometer consisting of a three -mirror-off-axis anastigmat (TMA)

a dispersive prism and an asphere mirror collimating and imaging system. This kind of imaging spectrometer works over the spectral region of 0.4~2.5 μm and the focal length is 800 mm

FN=4.5

FOV=1.43°

the MTF can reach 0.44~0.62

spectrum resolution is about 3~23 nm

and the total mass is about 70 kg. While the FN must be within 3 and the total mass will reach 100 kg if uses the type of imaging spectrometer of grating or interference Fourier transform spectrometer at the condition of the same properties of focal plane elements and SNR. It is showed that the system has an optimum configuration in high resolutions of ground and spectrum

short integral time and low accepted radiant energy

it can be used in selecting the optical configuration especially.