Application of acoustical activity in ferroelectrics for control of light intensity

The new technology is presented for measuring and control of light intensity. In the proposed method is used the Bragg light diffraction on the hypersonic wave in gyrotopic crystal. In this case the intensity of diffracted light is dependent on the sound frequency by square law. We can change the light intensity by modification of generator frequency by which the acoustic wave is excited. So the increasing or decreasing of light intensity is provided electronically, fluently and with high accuracy because the frequency of electromagnetic vibrations can be determined very precisely. Using previously the standard calibration, it is possible to measure and to change the light intensity to the necessary value. In present work acoustical activity and Bragg light scattering on hypersonic waves in LiNbO₃ ferroelectric crystal have been used for modeling on the offered technology by measuring of the laser light intensity with wavelength 632.8 nm.