I'm familliar with the basics of how an Echelle spectrograph works, and as far as anamorphic optics, I understand this to mean that not all of the elements are not cylindrically symmetric so that the size and divergence changes in one plane is different than in the perpendicular plane. The rectangular white-pupil is then re-imaged and compressed by the anamorphic VPH grism. In the latter direction, however, the pupil is sliced and superimposed on the echelle grating to minimize its size. I'm wondering what the pupil slicer is, and how it works exactly.Īt the entrance of the spectrograph, an anamorphic pupil slicing unit (APSU) shapes the beam in order to compress the beam in cross-dispersion direction but not in main-dispersion direction, where high resolving power needs to be achieved. Spectrograph (fiber output, pupil slicer, Echelle grating, collimator, dichroic splitter, Red and Blue cameras). Front Ends (corrections, stabilizations, fiber pick-up).Coudé Trains (transporting light from each of the VLT's four telescopes).The page describes three parts or th esystem: From there I looked at the Instrument Description and Performance page. This excellent answer points to ESPRESSO, - Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |