A laser system for optical waves mixing experiments

We built a neodymium glass laser delivering two simultaneous pulses having a frequency separation tunable by steps from 10 to 90 cm^-1. We used it to measure non-linear polarizabilities in glases and carbon disulfide by conventional coherent second Stokes and anti-Stokes techniques with unusual spectral filtering requirements. With the device described one can study in the 10^-13–10^-14 s range the kinetics of effects induced by the square of an electric field.