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Solar-stellar Spectrograph Upgrade (1Mar94)
(from NSO, NOAO Newsletter No. 37, 1 March 1994)

The final optical design for the cross-dispersing of the echelle
grating in the McMath-Pierce solar-stellar spectrograph includes up to
three prisms as the cross-dispersing elements.  The specifications have
been finalized, and it is anticipated that by the publication date of
this Newsletter the prisms will have been ordered from the vendor.  The
design of the transfer lens that will image the orders onto a
large-format, 1024 x 3072 CCD array has also been accepted, and the
optical elements are about to be ordered.  The design will provide a
high-throughput capability operating over a wavelength range extending
from the K-line to about 700 nm with good order separation.  The third
prism will be removable so as to provide enhanced throughput in the
blue with good order separation extending to about 520 nm.  The
modifications will include an option to permit the observer to still
use the conventional Milton & Roy gratings or the echelle grating with
an interference filter in a single-order mode.  Machining of the
mechanical components is now underway.
                                                                                Mark Giampapa, Jorge Simmons, Dave Jaksha

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