| A |
|
Slithead: A linear array of 320 optical fibers, each 180 microns
in diameter spaced on 180 micron centers. Manufactured by the University
of Washington, Seattle. The fiber ends fit a convex radius of curvature
of 25.2 inches. |
| B |
|
Collimator mirror: Substrate is a lightweight gas fusion mirror
blank made of Schott Tempax manufactured by Hextek. The frontal area
is a rectangular 16.4 x 6.9 inches. The surface figure is spherical with
a 49.76 inch concave radius of curvature good to about 1/10 wave over any
six inch diameter patch. Polishing was done by Hughes Danbury Optical Systems.
The surface is coated with protected silver by Denton Vacuum. |
| C |
|
Beamsplitter: Substrate is fused silica (9.0 x 10.2 x 1.5 inches)
manufactured by Corning and polished by Planar Optics. The incident surfaces
is has a dichroic coating with a crossover point of about 6000 Angstroms.
The exit surface has a broad band antireflection coating optimized from
6000 to 9100 Angstroms. Both coatings were applied by ZC&R Coatings
for Optics. |
| D |
|
Red Grism: The prism substrate is Ohara BSL7 (similar to Schott
BK7) glass. The entrance face is 6.75 inches wide and 7.5 inches high,
finished to 1/10 wave by Planar optics. The apex angle at the incoming
surface is 39.5 degrees. The front surface has a broad band antireflection
coating optimized from 6000 to 9100 Angstroms. The transmission grating
on the hypotenuse has 420 lines per mm and was manufactured from a new
master ruling by Hyperfine. |
| E |
|
Blue Grism: Same as (D) except the apex angle is 37.0 degrees,
the coating is optimized for 4000 to 6000 Angstroms and the grating has
640 lines per mm. |
| F |
|
Red Camera: The eight-element refracting
cameras have a focal length of 240 mm and an entrance aperture 7.0 inches
in diameter. The general design is by Harland Epps (UCSC) and is a descendant
of the Keck LRIS camera. All but one lens in each camera was ground and
figured by Harold Johnson Optical labs; the other lens has an aspheric
surface and was ground and figured at Lick Observatory. All air to glass
surfaces are coated with a broad band antireflection coating optimized
between 6000 and 9100 Angstroms. |
| G |
|
Blue Camera: The red and blue channels
were made as similarly as possible to avoid differential focus shifts between
the red and blue channels. The blue side has coatings optimized from 3900
to 6000 Angstroms. |
| H |
|
CCD: SITe 2048x2048 with 24 micron square pixels, antireflection
coated by SITe. Packaged in a liquid nitrogen cryostat by Princeton University. |
