Typical a short wavelength laser (<400 nm) is used for material ablation because of the relative high absorption of many materials in this wavelength range. Most of these systems have pulse durations of a few nanoseconds. In our experiment we are working with pulsed IR-lasers in the sub picosecond range. We produce thin layers with this system and examine the optical properties. Interesting optical properties are: Random Lasing, nonlinear conversion and saturation properties. More information about our experiment you can find here.