We present theoretical and experimental studies of the process of two-wave mixing of broadband radiation in BaTiO<sub>3</sub>. We show that the energy exchange in such a process can be calculated on the basis of a system of coupled-wave equations in which phase-mismatch diffraction processes are taken into account. Good agreement of the model predictions and measurements performed with a variable-bandwidth Ti:sapphire laser is reported. Reasonable amplification of light with a FWHM spectrum of as much as 10 nm is reported in a standard copropagation scheme; above this value a considerable gain decrease and significant spatial profile changes occur.
© 1999 Optical Society of America
A. Pecchia, M. Laurito, P. Apai, and M. B. Danailov, "Studies of two-wave mixing of very broad-spectrum laser light in BaTiO3," J. Opt. Soc. Am. B 16, 917-923 (1999)