HARMONI at ELT: optical design of the spectrograph sub-system
HARMONI is an adaptive optics assisted, near infrared integral field spectrograph for the European Extremely Large Telescope. It covers a spectral range from 750 nm to 2450 nm with resolving powers from 3000 to 7000 and spatial sampling of 25 mas and 6 mas. It can operate in two adaptive optics modes, SCAO and MCAO. The spectrograph represents the last optical sub-system of the HARMONI instrument optical train that disperses the light and forms a two-dimensional spectrogram on its scientific detectors. Changes in the top-level goals and specifications have led to a significant revision of the spectrograph optical design. The current baseline design consists of a two-mirror unobscured collimator, a set of six volume-phase holographic grisms, and a two-mirror unobscured camera. The design is more compact than the previous version, it uses anamorphic freeform mirrors to correct aberrations, and is expected to reach a minimum transmission 57% with improved accessibility of the detector unit and reduced scattered light.