Optical EngineeringReal-time imaging of grating formation in LiNbO3:Fe using Mach-Zehnder interferometer
|Format||Member Price||Non-Member Price|
A setup for observing formation of light-induced diffraction grating in LiNbO3:Fe in real time is presented. The utilization of this setup allows monitoring the temporal dependence of the diffraction efficiencies of several diffraction orders and observing the temporal evolution of the grating by means of the Mach-Zehnder optical interferometer at the same time. The part of the setup responsible for imaging of the space-time distribution of the refractive index changes in a crystal is advantageous to those making long-period gratings in various photorefractive materials because of easy and direct readout of both the grating spacing and the amplitude of the refractive index modulation. These two parameters are well controlled, and the recording of the grating can be stopped after desired values are reached.