Photoinduced scattering of light by fluctuations of photoelectric parameters of a medium

Light-induced backward scattering in LiNbO3:Fe,Zn

“…Both defects and bulk inhomogeneity of crystals act as scattering centers for the incident beam. In addition, small-scale fluctuations 6 of the photoelectric pa-rameters of crystals also play the role of optical scattering centers. For example, small-scale spatial variation of the photogalvanic tensor is considered as a key parameter for light-induced backward scattering in c-cut lithium niobate.…”

“…For example, small-scale spatial variation of the photogalvanic tensor is considered as a key parameter for light-induced backward scattering in c-cut lithium niobate. 6 When a focused light illuminates the crystal, the backward scattering takes place because of the small-scale stochastic refractive index modulation ͑of the order of the optical wave-length͒, which results from the spatial variation of the photogalvanic tensor.…”

“…Note that the converging pump beam propagates along the negative c axis of the crystal as in this way backward scattering would be induced while the so-called ''scattering self-wave'' is forbidden. 6 A laser power meter ͑LPM1͒ or a recorder ͑R͒ was used to monitor the backward scattering extracted by a beam splitter ͑BS͒, while another laser power meter ͑LPM2͒ watched the variation of the incident beam intensities. The crystal was a͒ Electronic mail: jjxu@nankai.edu.cn slightly tilted to prevent specular reflection from entering LPM1.…”