Femtosecond laser amplification in Mgo:LiTaO3 crystals with modulated nonlinear characteristic

This work presents a theoretical study of the parametric amplification of optical radiation in crystals with a periodic modulation of the quadratic nonlinear susceptibility, using MgO: LiTaO₃ as an example. Special attention is given to analyzing the influence of basic factors, such as linear absorption and dispersion, on process efficiency. It is found that in the infrared spectral range, linear absorption and dispersion effects significantly affect the signal wave amplification coefficient, determining the energy redistribution dynamics and spectral characteristics of the resulting radiation. The obtained results are important for optimizing nonlinear crystal parameters, developing efficient parametric amplification schemes, and creating promising optical devices operating in the infrared range.