System for time-resolved spectroscopy using a semiconductor picosecond laser

Optical time-resolved spectroscopy using optical fibers opens up new possibilities for research on highly scattering materials. We present a system that measures the time of flight distribution of light propagating through such materials. The system employs a picosecond semiconductor laser, a photon counter using an avalanche photodiode working in Geiger mode and standard, gradient index profile, multimode fibers. We present the results of measurements obtained using this system and conclusions regarding the further improvement of the system.