| 摘要 |
<p>The invention relates to a Dyson-type imaging spectrometer that includes an input port (1) extending in a direction X, an output port, a diffraction array (4) including a set of streaks on a concave substrate, an optical system including a lens (2), said lens having a first planar surface (8) and a second convex surface (3), the convex surface of the lens and the concave surface of the diffraction array being concentric, wherein said optical system is capable of receiving a light beam from an input port and of directing the same towards the diffraction array, and of receiving a beam diffracted by the diffraction array and of forming a spectral image of said diffracted beam in a plane (7) of the output port, wherein said spectral image can be spatially resolved in an extension direction X' of the image of the input port. According to the invention, the diffraction array (4) includes a set of nonparallel and non-equidistant streaks and/or the substrate of the diffraction array is nonspherical so as to form an image of the input port in the output plane having an improved image quality and very small distortions.</p> |
