AMBER Spectrograph

Overview

• Separation of the specroscopic beams from the photometric beams.
• Spectral analysis at three different resolving power values, by the means of selecting either a prism (LR mode, R=30), a medium resolution grism (MR mode, R=1500), or a high resolution grism (HR mode, R=12000).
• Formation of the images on the detector plane.

All these functions are accomplished in the spectral range which covers the astronomical red / near-infrared bands J, H, and, K (i.e. 1.05 to 2.4 µm). The optics and the support structure are contained in a vacuum tight cryostat which allows the cooling of the whole spectrograph to the working temperature of about 77K by means of liquid nitrogen at atmospheric pressure.

Further Information

An indepth description with designs and drawings of the AMBER Spectrograph (SPG) can be found at: AMBER SPG web-site at ARCETRI.