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

A. Bounab; O. Boulade; C. Cervera; X. de la Broïse; C. Delisle; Q. Dong; Y. Jin; A. Lamoure; L. Mathieu; V. Moreau; P. Mulet

doi:10.1117/12.2561458

13 December 2020 LWIR quantum efficiency measurements using a calibrated MCT photodiode read by a cryo-HEMT-based amplifier

A. Bounab, O. Boulade, C. Cervera, X. de la Broïse, C. Delisle, Q. Dong, Y. Jin, A. Lamoure, L. Mathieu, V. Moreau, P. Mulet

Author Affiliations +

Proceedings Volume 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX; 1145428 (2020) https://doi.org/10.1117/12.2561458
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

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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A. Bounab, O. Boulade, C. Cervera, X. de la Broïse, C. Delisle, Q. Dong, Y. Jin, A. Lamoure, L. Mathieu, V. Moreau, and P. Mulet "LWIR quantum efficiency measurements using a calibrated MCT photodiode read by a cryo-HEMT-based amplifier", Proc. SPIE 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX, 1145428 (13 December 2020); https://doi.org/10.1117/12.2561458

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