CRIRES User Manual
Doc. Number: ESO-254264
Doc. Version: P109.4
Issued on:
2021-12-01
Page:
23 of 99
Document Classification: ESO Internal Use [Confidential for Non-ESO Staff]
Figure 15: Integrating Sphere assembly. The FPI- fiber is visible on the right.
Figure 16: Calibration carriage stage assembly.
The following elements are inserted in the light path by a carriage stage place just before
the derotator mirror (see Figure 16): (i) The new polarimetry unit;; (ii) a gas-cell either for
wavelength calibrations when used with the halogen lamp (which creates an absorption
spectrum), or for accurate radial-velocity measurements, similar to the way for the iodine
cell technique;; (ii) a pinhole used for calibration purposes;; (iii) an AO fiber for MACAO
calibrations;; (iv) an Uranium-Neon (UNe) Lamp for wavelength calibration. This carriage
has also a free position, with no optical element.
