Fig.1a. The optical layout of the echelle spectrometer NES (the plane view):
  • S - slit unit;
  • M1, M2, M3 - collimator's mirrors;
  • E - mosaic echelle;
  • G - cross dispersion grating;
  • O - camera;
  • D1 - CCD.
Fig.1b. The optical layout of the echelle spectrometer NES (the side view). 		NES_optics

The layout of the preslit unit is presented here

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