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  4. InGaAs APD matrix sensors for SWIR gated viewing
 
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2019
Journal Article
Title

InGaAs APD matrix sensors for SWIR gated viewing

Abstract
Short-wavelength infrared (SWIR) detection systems are increasingly in demand for surveillance, reconnaissance, and remote sensing applications. Eye-safe SWIR lasers can be utilized for active imaging systems with high image contrast and long detection range. The gated-viewing (GV) technique using short-pulse lasers and fast-gated cameras in the nanosecond range enables utilizing the distance information in addition to the signal intensity of the acquired images. The InGaAs material system is very well suited for the fabrication of high-performance SWIR photodetectors providing a typical cutoff wavelength of 1.7 mm, which covers the emission lines of available laser sources at typical telecom wavelengths around 1.55 mm. However, the usually short integration times needed for GV leads to very small photosignals. We report on the development of SWIR avalanche photodetector (APD) arrays with 640 × 512 pixels and 15 mm pixel pitch based on the InGaAs material system. The InGaAs-APD focal plane arrays have been successfully integrated into SWIR cameras which yield gain values of M ≈ 10 on camera level at a reverse bias voltage around 21 V and are the first InGaAs-based SWIR cameras worldwide providing a 640 × 512 image format and utilizing avalanche gain for signal amplification. The camera performance is demonstrated by SWIR laser GV sample images.
Author(s)
Rutz, Frank  orcid-logo
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Aidam, Rolf  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Heussen, Henning
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Bronner, Wolfgang  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Rehm, Robert  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Benecke, Matthias
AIM Infrarot-Module GmbH
Sieck, Alexander
AIM Infrarot-Module GmbH
Brunner, Simon  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Göhler, Benjamin  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Lutzmann, Peter  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Journal
Advanced Optical Technologies  
Open Access
File(s)
Download (654.14 KB)
DOI
10.24406/publica-r-261120
10.1515/aot-2019-0039
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Keyword(s)
  • avalanche photodiode

  • focal plane array

  • gated viewing

  • short-wavelength infrared

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