Dual concave grating anastigmatic spectrometer with high spectral resolution for remote sensing.

A dual concave grating imaging spectrometer with anastigmatic imaging has been presented for remote sensing. The optimal arrangements of the gratings and the addition of a cylindrical lens have been determined based on different aberrations and the major corresponding parameter analysis. The advanced Wadsworth mounting can eliminate coma and astigmatism and realize high spectral resolution with low ruling density gratings. The design presents excellent optical performance: the spectral resolution is 0.6 nm, and spatial resolution is 1 mrad/pixel over the waveband of 400 nm centered at 600 nm with NA 0.1. The manufacture and testing of the prototype prove the principle of design and the engineering practicality.