Gsg. Quirino et al., INTERFEROMETRIC MEASUREMENTS OF THE PHOTOINDUCED REFRACTIVE-INDEX PROFILES IN PHOTOREFRACTIVE BI12TIO20 CRYSTAL, Optics communications, 123(4-6), 1996, pp. 597-602
By direct interferometric measurement in Bi12TiO20 under external DC e
lectric field, we demonstrate that the steady-state photorefractive le
ns produced by the laser beam with the initial circular cross-section
is essentially anisotropic: its focusing strength along the direction
of the applied electric field is remarkably higher. Experimental data
are supported by computer simulations and analytical results.