SHARP II+ System for High Angular Resolution Pictures
II+ is a near infrared camera which has been specially designed for
the use with the adaptive optics system ADONIS
at the ESO 3.6m
telescope. SHARP II+ is a camera for diffraction limited imaging in
the spectral range from 1.1 to 2.45
, using a Rockwell NICMOS 3 array (HgCdTe,
elements) as detector and supplying three image scales of 35, 50 and 100
A cold shutter allows to use integration times down to 20 ms for
bright sources. A Lyot stop reduces the background radiation produced by
the telescope and the optical components in the beam. For photometry, standard
bandpass filters (J, H, K and K') are available. Low resolution spectroscopy
is provided by a set of narrow band filters (R
100) at selected line positions and a CVF (Circular Variable Filter, R
60) for the 1.4 to 2.4
range. The CVF is also used as an order selector for two K-band Fabry-Perot
etalons with spectral resolutions of 1000 and 2200 respectively. A
wire grid polarizer can be inserted into the beam in front of the camera.
For highest resolution imaging in J- and H-band, an atmospheric
dispersion corrector is available.
Please see the online
manual for more details (click here
for the gzipped Postscript file).
Wed Apr 23 16:00:15 MDT 1997