Optoelectronic Devices

In the field of optoelectronics, we mainly develop photodetectors and semiconductor lasers for the infrared spectral range (wavelength > 1,5 µm), but also for the solar-blind ultraviolet spectral range ( < 280 nm).

 

  • We customize our lasers for the emission range of 2 – 11 µm, particularly focussing on quantum cascade lasers and optically pumped semiconductor disk lasers.

  • With regard to infrared photodetectors our focus lies on matrix and single detectors of highest performance based on antimonic typ II superlattices and InGaAs. We develop highly sensitive avalanche photodiodes (APDs) with integrated signal amplification for the detection of very weak optical signals. Our bispectral detectors allow for color vision in the infrared regime.

 

Semiconductor lasers  

 

 

Applications:

  • spectroscopic sensors – real-time detection of solid substances
  • medical applications
  • safety applications – stand-off detection of hazardous substances

 

Quantum cascade lasers

We currently focus on the following developments:

  • Improving the output power and performance efficiency
  • Preservation of the beam quality
  • Optimization of the epitaxial semiconductor layer structure
  • Efficient heating of components via improved packaging technology

 

Optically pumped semiconductor disk lasers

Experts of Fraunhofer IAF conduct research on the basis of group III antimonides in order to extend the functionality of semiconductor lasers. An example is the integration of chips in external resonators in the form of compact laser modules for spectrally fast tunable laser systems.

 

 

 

 

Photodetectors  

Infrared detectors

Matrix and single detectors of highest performance:

  • InAs/GaSb type II superlattices for the mid- (MWIR, 3 – 5 µm) and long-wave infrared (LWIR, 8 – 12 µm)
  • InGaAs for the short-wave infrared (SWIR, < 1.7 µm)
  • AlGaN for the solar blind ultraviolet regime (< 280 nm)

Devices using heterojunctions are being developed in order to improve the performance. These have significant advantages over commonly used homojunction devices, particularly in the field of dark current and noise behavior.

 

Avalanche photodiodes

We develop highly sensitive avalanche photodiodes (APDs) with integrated signal amplification for applications that require the detection of very weak optical signals.

We do this for the solar-blind ultraviolet spectrum below 280 nn as well as for the short-wave infrared (SWIR, 0,9 – 1,7 µm), for which we optimize AlGaN and InGaAs APDs.

 

 

Hermetically sealed high-performance LEDs  

The use of light ceramics in combination with innovative packaging technology can significantly improve the range of applications of LEDs in hot, wet or chemically contaminated environments.

To improve the efficiency of LED modules researchers of Fraunhofer IAF are working on:

  • compact power converters for LED modules
  • energy-saving control electronics for LED power converters
  • intelligent LED controls

Human and environmental factors are also being taken into account.

Current research projects

Key Publications

Detectors

JahrTitel/AutorDokumentart
2017Low dark current in mid-infrared type-II superlattice heterojunction photodiodes
Schmidt, Johannes; Rutz, Frank; Wörl, Andreas; Daumer, Volker; Rehm, Robert
Zeitschriftenaufsatz
2016SWIR detectors for low photon fluxes
Rutz, Frank; Kleinow, Philipp; Aidam, Rolf; Bronner, Wolfgang; Stolch, Lukas; Benecke, M.; Sieck, A.; Rehm, Robert
Konferenzbeitrag
2013Four-component superlattice empirical pseudopotential method for InAs/GaSb superlattices
Masur, J.-M.; Rehm, R.; Schmitz, J.; Kirste, L.; Walther, M.
Zeitschriftenaufsatz
Diese Publikationsliste wurde aus der Publikationsdatenbank Fraunhofer-Publica erstellt.

Semiconductor Lasers

JahrTitel/AutorDokumentart
2017GaSb-based VECSEL for high-power applications and Ho-pumping
Holl, Peter; Rattunde, Marcel; Adler, Steffen; Scholle, Karsten; Lamrini, Samir; Fuhrberg, Peter; Diwo-Emmer, Elke; Aidam, Rolf; Bronner, Wolfgang; Wagner, Joachim
Konferenzbeitrag
2017Hyperspectral data acquisition and analysis in imaging and real-time active MIR backscattering spectroscopy
Jarvis, Jan-Philip; Härtelt, Marko; Hugger, Stefan; Butschek, Lorenz; Fuchs, Frank; Ostendorf, Ralf; Wagner, Joachim; Beyerer, Juergen
Zeitschriftenaufsatz
2017Influence of air pollutants on the lifetime of LEDs and analysis of degradation effects
Zibold, Andreas; Dammann, Michael; Schmidt, Ralf; Konstanzer, Helmer; Kunzer, Michael
Zeitschriftenaufsatz
2017Real-time spectroscopy enabled by external cavity QCLs with MOEMS diffraction gratings
Butschek, Lorenz; Hugger, Stefan; Jarvis, Jan-Philip; Härtelt, Marko; Merten, André; Grahmann, Jan; Boskovic, Dusan; Fuchs, Frank; Ostendorf, Ralf; Schilling, Christian; Rattunde, Marcel; Wagner, Joachim
Konferenzbeitrag
Diese Publikationsliste wurde aus der Publikationsdatenbank Fraunhofer-Publica erstellt.

Further Information

 

For Networkers

Information about how to cooperate with Fraunhofer IAF can be found at the following link.

For Customers

General information about the research on »Optoelectronic Devices« at Fraunhofer IAF can be found at the following link.