Pm. Johansen et al., STEADY-STATE ANALYSIS OF AC SUBHARMONIC GENERATION IN PHOTOREFRACTIVESILLENITE CRYSTALS, Physical review. A, 58(2), 1998, pp. 1601-1604
The stationary solution is obtained for the photorefractive subharmoni
c gratings excited in crystals of the sillenite family by a standing l
ight interference pattern and an applied ac electric field. We show th
at the main subharmonic with doubled spatial period may become unstabl
e against excitation of the subharmonic with quadrupled spatial period
. The threshold condition for this bifurcation is found. [S1050-2947(9
8)05808-9].