Patent ID: 6717670
Filing Date: 2004-04-06
Classification: G01J

Abstract:
A spectrometer comprisinga light source of a selected wavelength, an echelle-grating for dispersing radiation incident thereon in a dispersion plane, means for directing a light beam from said light source in an incident path of rays onto said echelle-grating to be dispersed thereby, means for moving said echelle-grating into a first position and a second position, said first position being selected to return said light beam after one single dispersing passage over said echelle-grating as a single-dispersion light beam into said incident path of rays, reflecting means for receiving a dispersed light beam from said echelle-grating, when said echelle-grating is in its second position, and for directing said dispersed light beam onto said echelle-grating for a selected number of further dispersing passages to provide a multiple-dispersion light beam, said echelle-grating, in its second position, being arranged to return said multiple-dispersion light beam into a direction the projection of which on said dispersion plane lays in the reverse direction of said incident path of rays, and further comprising means for deviating at least one of said beams from said dispersion plane, whereby said returned light beams extend in different planes.