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Proceedings Paper

Infrared detector development programs for the VLT instruments at the European Southern Observatory
Author(s): Gert Finger; Peter Biereichel; Hamid Mehrgan; Manfred Meyer; Alan F. M. Moorwood; Gianalfredo Nicolini; Joerg Stegmeier
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Paper Abstract

Instrument platforms like the VLT represent a new challenge to IR focal plane technology. Since the large telescope diameter and the improved image quality provided by adaptive optics reduce the pixel scale, larger array formats are needed. To meet this challenge ESO is participating in development programs for both InSb and HgCdTe large format arrays. To cover the spectral region of 1 to 5 micron ESO has funded a foundry run at SBRC to produce 1024 X 1024 InSb arrays, which will be installed in ISAAC, the IR Spectrometer and Array Camera built for the VLT. Since the delivery of the 1K X 1K InSb array is delayed, the test results obtained with a 256 X 256 InSb array and the application of off chip cryogenic amplifiers to InSb detectors will be discussed. Results obtained with a (lambda) c equals 2.5 micrometers Rockwell 1024 X 1024 HgCdTe array will be presented, where an off chip cryogenic operational amplifier was used yielding a rms read noise of 3 electrons. Sensitivity profiles of individual pixels have been measured with a single mode IR fiber. Limitations of PACE 1 technology, such as persistence, will be discussed. First results with the 1K X 1K array, which was installed in SOFI, an IR focal reducer providing 1-2.5 micron imaging and long slit grism spectroscopy at the NTT telescope, will be presented. Advanced techniques of real time image sharpening will also be included. An outlook to the development of (lambda) c equals 2048 X 2048 HgCdTe array formats will be given. The optical layout of NIRMOS, a multi-object spectrograph for the VLT telescope, is base don the availability of 2K X 2K HgCdTe arrays.

Paper Details

Date Published: 21 August 1998
PDF: 12 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317209
Show Author Affiliations
Gert Finger, European Southern Observatory (Germany)
Peter Biereichel, European Southern Observatory (Germany)
Hamid Mehrgan, European Southern Observatory (Germany)
Manfred Meyer, European Southern Observatory (Germany)
Alan F. M. Moorwood, European Southern Observatory (Germany)
Gianalfredo Nicolini, European Southern Observatory (Germany)
Joerg Stegmeier, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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