Femtosecond visible light pulse method for measuring dielectric coefficient of non-linear crystal

摘要

The measuring method uses two optical pulses incident on a crystal sample where they generate a transitory grating. A third visible pulse is diffracted by the grating. The diffracted light is detected function of time.A Fourier transform is applied to the signal detected. An equation that gives the variation of the dielectric coefficient function of frequency is used to calculate the refraction index