Instrument Database

General information

  • Investigation area
  • Techniques
    Low temperature photoluminescence
    Raman spectroscopy
  • Manufacturer
  • Fabrication year
  • Measured quantity
    Photoluminescence and Raman signal giving rise to numerous measured quantities (strain, doping concentration, carrier mobility, native and foreign defects, excitons, band-band transitions, etc.)
  • Main application
    Measuring photoluminescence and Raman spectra down to a temperature of 9 K in a closed-cycle He-cryostat.
  • High-throughtput analysis

Instrument specification

  • Technical aspects

    The setup has two mapping functions allowing to map the photoluminescence and Raman spectra on a large scale (several centimeters) and a small scale (100 x 100 µm², sub-µm steps). Various microscope objective lenses are available for the second mapping option. Furthermore, the entire setup can be adapted to individual needs, giving rise to the name "FlexPL". A multitude of optics (filters, polarizers, waveplates, etc.) can be added to the beam path to ensure best spectroscopic results. High resolution but also overview photoluminescence spectra can be obtained in a spectral range of 360 - 950 nm (CCD and poit-detector detection). Therefore, various excitation sources are available (355 nm, 405 nm, 532 nm, 630 nm). Raman spectra can be acquired with a 532 nm and 630 nm laser. The setup is build in a "microscope configuration", allowing for an imaging of most sample surfaces by light microscopy.

  • Additional measurement possibilities
    Depending on the outcome of the measurements with the FlexPL system, there is always the possibility to transition towards other spectroscopic equipment of the AG Callsen based on a collaboration.


Instrument location

  • Group
  • Building
  • Faculty
    Fachbereich 1
Updated by: MAPEX