We find strong optical nonlinearities in SrxBa1−xNb2O6 (x = 0.61 and x = 0.75) and in BaTiO3 crystals caused by thermally induced changes of the refractive indices. This gives strong spatial self-phase modulation and self-focusing of Gaussian light beams and light-induced birefringence. The light intensities are of the order of 102–103 mW/mm2, and the time response of the effect is of the order of milliseconds.
© 1992 Optical Society of America
Original Manuscript: August 15, 1991
Published: April 1, 1992
Moshe Horowitz, Ron Daisy, Ofer Werner, and Baruch Fischer, "Large thermal nonlinearities and spatial self-phase modulation in SrxBa1−xNb2O6 and BaTiO3 crystals," Opt. Lett. 17, 475-477 (1992)