Dynamics of photorefractive diffraction in KTa/sub 1-x/Nb/sub x/O/sub 3/ crystals

Although the photorefractive properties of KTaNbO/sub 3/ (KTN) crystal, one of the first identified photorefractive crystals, have been investigated in more detail in recent years, its photorefractive diffraction dynamics have been rarely studied. However, these studies might be important for understanding the mechanism of the photorefractivity including the need for a complicated photorefractive model and the influences of the internal dc electric field induced during writing with an applied field. In this presentation, our experimental investigations of photorefractive diffraction dynamics during writing, reading and erasing in a cubic KTN crystal will be reported systematically. Here, we studied not only the diffraction from the first-order grating but also the diffraction from the second-order grating.<>