Patent ID: 8681329

Claim:
An Echelle spectrometer assembly with internal separation of the orders, comprising an entrance slit and an image plane for imaging radiation having an intensity entering through said entrance slit on said image plane, an Echelle grating for the spectral separation of radiation in a main dispersion direction in a plurality of orders, a dispersing element for the separation of said plurality of orders by means of the spectral separation of the radiation in a lateral dispersion direction forming an angle with said main dispersion direction of said Echelle grating such that a two-dimensional spectrum with a plurality of separated orders is generated, an imaging optical assembly for imaging said radiation entering into said Echelle spectrometer assembly through said entrance slit into said image plane, and a detector having a two-dimensional arrangement of a plurality of detector elements in said image plane, and predispersion means for predispersion of radiation in the direction of said lateral dispersion of said dispersing element, and wherein said predispersion means comprise a predispersing element, which is arranged along the optical path behind the entrance slit inside the spectrometer assembly, said imaging optical assembly is designed in such a way that said predispersed radiation is imaged into an additional image plane with a spatial and a spectral radiation density the image plane being free of mechanical limitations and being arranged along the optical path between said predispersing element and said Echelle grating, and optical means are provided in said additional image plane with said predispersed spectrum for manipulating said spatial and/or spectral radiation density distribution at said detector.