Download User Manual

14
Issue 1.1
Grating
210
210
210
210
Band
λmin
λcen
λmax
∆λ
K
H
J
z
2.025
1.541
1.169
0.893
2.200
1.650
1.250
0.960
2.353
1.743
1.319
1.017
0.328
0.202
0.150
0.124
H+K
1.475
1.930
2.355
0.880
Ks
1.890
2.170
2.423
0.533
zJHK
zJHK
zJHK
zJHK
200 H+K
150 Ks
LUCIFER User Manual
Table 5: Wavelength coverage for the gratings with the N1.80 camera at the nominal center wavelength.
For the N3.75 camera multiply ∆λ by 0.48.
Grating
Band
210
210
210
210
z
J
H
K
0.87 ...
1.05 ...
1.40 ...
2.10 ...
OrderSep
1.49 ... >2.4
zJHK
zJHK
zJHK
zJHK
200 H+K
λrange (µ)
1.02
1.28
1.70
>2.4
Table 6: Wavelengths which can set at the center of the detector. Careful: the ranges given represent
the physical limits of what can be achieved with the grating tilt and does not take into account the
limits of the filters used for order separation.
of the camera, the other one is placed in one of the positions of filter wheel #1. (Fig. 3) presents a
current pupil image of LUCIFER. Because of the structure of the one-armed swingarm support, the
diffraction spikes are not standard. The LBT PSF has an asymmetric 10-armed diffraction pattern,
rather than the usual 4-arm from typical spiders.
The displacement of the pupil to its stop causes presently a light loss of about 17%. This will be
corrected during the next warm-up of the instrument.
3.1.6
N1.8
Cameras
This camera is designed for seeing-limited spectroscopy for covering one single broad
band (z, J, H or K). The image scale of this camera is 0.25 00 /pixel. The maximum
distortion is less than 0.1 % within the 4 arcmin field. It can also be used for imaging
in seeing limited mode, but bear in mind that the lateral color is not corrected.
N3.75 It is dedicated for both seeing-limited imaging and seeing-limited slit spectroscopy. The
image scale of this camera is 0.12 00 /pixel. In spectroscopic mode it covers about half
of the zJHK bands wavelength range at higher resolution (for an equivalent slit width
defined in pixel compared to the N1.80 camera).
N30
This camera (0.015 00 /pixel) is intended to be used for diffraction-limited imaging and
longslit spectroscopy, together with the adaptive optics. The sampling of this camera
is optimal for the FWHMAiry of the J band (2.0 pixel). The H and K bands are
oversampled (2.73 pixel and 3.73 pixel respectively). It is currently not available.
The available modes are also given in Tab. 1 and Tab. 2.