Diffusing Wave Spectroscopy (DWS)
We have installed two DWS-setups at the University of Fribourg to extend our light scattering capabilities to the regime of highly turbid systems. A home-built setup is shown in the figure above. The sample cell is mounted into an index matching water bath which can also serve as a temperature control reservoir.
A polarizer/lambda half wave plate setup allows a continuous variation of the incident light intensity coming from a solid state laser (Cobolt at 532 nm, 150 mW). The scattered light can be detected either in transmission (no polarization dependence) or reflection. In reflection geometry a polarizer allows the detection
of VV and VH scattered light. The setup is designed in order to fulfill all requirements for a correct DWS measurement: