When a laser beam passes through an α-LilO3 single crystal under the action of a DC electric field along the c-axis, it is found that bands of scattered light are produced. The bands are perpendicular to the c-axis and subtend large, angles with the crystal as vertex. The distribution of intensity of the band is not symmetric with respect to the transmitted light spot. When the electric vector of incident beam is perpendicular to the c-axis, then that of scattered beam would be parallel to the c-axis; and when the former is parallel to the c-axis, then the latter would be perpendicular to the c-axis. If the former is neither perpendicular nor parallel to the c-axis then two bands would appear, the electric vectors of which are parallel and perpendicular to the c-axis respectively. Under specific condition, these bands coincide. The polarization, intensity and relaxation behaviour of these bands have been studied in detail. We believe that these bands result very likely from some effect of carriers moving along the c-axis in the crystal. In addition we have observed the defects in the crystal under the action of a DC electric field with optical microscope.
下载:
