Instantaneous Characteristics of Diffraction and Transmission of Photorefractive Grating Illuminated by Ultra-short Pulse Laser
超短脉冲光通过光折变体光栅衍射及透射光强的瞬时变化特性研究

Based on the coupled wave theory of Kogelnik,the time-domain diffraction and transmission of PR gratings were theoretically studied when they were illuminated by ultra-short pulse laser.The waveforms of the diffracted and transmitted pulses depend on the parameters of readout pulse duration,grating spacing,crystal thickness and modulation of the refractive index were found.By changing values of these parameters,the diffracted and transmitted waveforms could be controlled to satisfy our desires.It is found that the diffracted and transmitted pulses have a displacement along the t-axis,and the value depends on those parameters.