Transcript Reinhold Dorn Presentation to the Director General Monday

A ultra low photon background 1 to 5 micron
detector mosaic test facility
Reinhold J. Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer, L. Mehrgan,
M. Meyer, A. Silber and J. Stegmeier
European Southern Observatory - Instrumentation Division
7/18/2015
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Design of the test facility
Cryogenic blackbody with
the epoxy spiders and
heating resistors
Detector mosaic facing down
looking inside the structure.
The cryogenic preamplifiers
and
the
cold
braid
connection are shown.
Filterwheel with J,
H, K, L, M filters
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IR detector mosaic testfacility
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Functionality and cryogenic
performance of the detector system
Optimization of feedtroughs and
radiation shielding
Darkcurrent and readnoise for very low
flux applications
Cosmetic quality, uniformity and
electroluminescence
Quantum efficiency in J, H, K, L and M
Analog bandwidth of the video output
Measurement of instrumental photon
background
Photon transfer curve and calibration
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Applications:
The CRIRES and Hawk-I focal plane mosaics
The first application for the testfacility was the
CRIRES 512 x 4096 pixels Aladdin InSb focal
plane array mosaic the newly developed 3-side
buttable package as seen on the right side.
The second application for the new testfacility
is the Hawk-I detector mosaic with four 2kx2k
Rockwell HgCdTe MBE buttable arrays with
2.5µm cut-off. GL Scientific is providing the
packaging and mount.
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Examples of Results
Some results obtained with the CRIRES detectors are shown below as an example.
Photon transfer curve for an Aladdin array
Comparison of efficiency corrected for cos4 dependence of
illumination and different conversion gains
Map of efficiency of CRIRES mosaic with pinhole grid mask
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