Hercules
Optical design
The HERCULES spectrograph. The front two sections of the tank have been removed so that the interal layout can be clearly seen.
The optical path. Two Zemax ray traces are shown
[Click on images for an enlarged view]
A close-up of the echelle grating and cross-dispersing prism. The grating is an R2 design with 31.6 gr/mm, and a 217 by 417 mm ruled area.
A close-up of the layout of the (from left to right) CCD camera, fold-mirror (with off axis hole), Schmidt mirror, Schmidt corrector plate, and collimator mirror.
