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Communication Dans Un Congrès Année : 2021

LWIR quantum efficiency measurements using a calibrated MCT photodiode read by a cryo-HEMT-based amplifier

Résumé

We present a new development for the measurement of the Quantum Efficiency (QE) of a Mercury Cadmium Telluride (HgCdTe or MCT) detector array in the long wave infrared (LWIR) spectral band. To measure the incident photon flux on the detector, CEA-LETI has designed and produced a calibrated MCT photodiode which, under the test setup conditions used for the QE measurement, delivers a total (dark plus photonic) current of 1nA at 60K. The readout of such a low level of current makes a standard room temperature amplifier inconvenient due to the length of the wires between the focal plane (FP) at cold and the outside of the cryostat (>2m in the current cryostat). A much better approach is to use High Electron Mobility Transistors (Cryo-HEMTs), optimized by CNRS/C2N laboratory for ultra-low noise at very low temperatures (<1K). We have developed a Cryo-HEMT-based transimpedance amplifier to readout the photonic current of the calibrated MCT chip. The paper describes the calibrated photodiode, the Cryo-HEMT amplifier and the test setup, and shows the results of the QE measurements of the LWIR detector.
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Dates et versions

hal-03322159 , version 1 (31-08-2021)

Identifiants

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Ayoub Bounab, Olivier Boulade, Cyril Cervera, Xavier de La Broïse, Cyrille Delisle, et al.. LWIR quantum efficiency measurements using a calibrated MCT photodiode read by a cryo-HEMT-based amplifier. X-ray, Optical, and Infrared Detectors for Astronomy IX, Dec 2020, Online Only, California, United States. pp.86, ⟨10.1117/12.2561458⟩. ⟨hal-03322159⟩
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