Abstract
The effect of an external electric field on the R absorption lines of LiNbO3:Cr3+ crystals has been studied by a high-sensitivity differential technique at 77 K. Linear Stark effect has been observed in a field directed along the trigonal crystal axis. No effect of the field was observed when directed perpendicular to this axis. These characteristics of the Stark effect provide a convincing argument for the electric dipole moments of Cr3+ centers being oriented along the trigonal C3 axis of the crystal and indicate that the chromium centers in LiNbO3 have C3 symmetry.
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