We have four setups for non-linear optical measurements (1) Second Harmonic Generation (both from bulk and surfaces), (2) z-scan measurements, (3) Degenerate four wave mixing (DFWM), (4) pump and probe apparatus (see picture). We also carry out the light amplification experiments both in the visible and in the infrared range of the electromagnetic spectrum. The main apparatus are: a Nd:YAG laser coupled with a power Optical Parametric Oscillator (Nd:YAG has 1J at 1064 nm, and the OPO is tuneable within 400 and 2000 nm, both Nd:YAG and OPO work at 10 Hz repetition rate and the pulse duration is respectively 6 and 4 ns); optical table; a f=250 mm monochromator/spectrograph working both in the visible (two gratings) and the NIR (with a third grating); for the visible range the detector employed is a 1024x128 pxl CCD whilst for the NIR range the detector is a CW, Peltier-cooled InGaAs detector (operable in a "lock-in mode" too). The equipment is completed with Si detectors, electrometers, a VIDICON infrared camera and everything is managed with a Pentium III PC. We will also use the light sources mentioned in Ultrafast laboratory for experiments.