The Raman Spectroscopy Laboratory is equipped with a WiTEC Alpha300R system. This instrument supports Raman spectroscopy using six excitation lasers with wavelengths of 355, 405, 488, 532, 633, and 785 nm. A confocal microscope focuses the laser beam onto the sample via multiple objectives, offering magnifications ranging from 10x to 100x and featuring various working distances.
Samples are placed on a movable stage with lateral scanning capability. A piezoelectric drive enables precise steps smaller than 100 nm. The system includes three spectrometers, each equipped with a highly sensitive CCD detector. The software supports both single-spectrum measurements and mapping, wherein a complete spectrum is recorded at each point across the mapped area.
Two optical systems equipped with Bragg gratings make it possible to measure both the Stokes and anti-Stokes regions of the Raman spectrum with exceptionally small Raman shifts below 10 cm-1 (depending on the sample). The laboratory also features a helium cryostat capable of cooling samples down to approximately 4 K.
The measured data can be processed and visualized using different statistical methods.
Equipment:
- WiTeC Alpha 300R microRaman system
- unit for polarization measurements
- Bragg gratings for excitations 532 nm and 785 nm for measuring the spectra down to ~10 cm-1
- LHe cryostat
- xyz piezo table for 2D and 3D mapping
Application:
- Raman measurements
- Photoluminescence measurements from 360 nm to 2200 nm
Contact: Dr. Martin Hulman, +421 2 5922 2974
Access: Individual access after introductory training (4 hours), online booking
Price: 0 Eur/hour for SAS employees
Overview of the Raman system from WiTeC