Spectrograph optics for HRS-SALT

Thales Seso has full capabilities to design, manufacture, assembly and test spectrograph optics such as dioptric Collimator and Camera assemblies. The Bue and Red CAM assemblies for the High Resolution Spectrograph of the South African Large Telescope was a. typical example of Thales Seso know how in such business.

Key-features of the HRS-SALT COL and CAM optics:

• Spectral range : 365-550nm (for Blue CAM) and 550nm to 1050nm (for Red CAM)
• Pupil size: in the range of 200mm-240mm
• Use of i-line glasses, very likely for their transparency down to UV but having high CTE so inducing difficulties to design a mount compatible with large temperature range but avoiding risk of thermal breakage of the lenses when mounted din mechanical barrel.
• Use of one evenasphere surface in each Col and CAM

The Thales Seso design heritage and past experience in such spectrograph optics is very large.
As few examples, we point out here after some of our deliveries in such business: