Investigation of Absorption Effects in the Parametric Amplification of Laser Radiation in MgO:LiTaO₃ Crystal.
Abstract
In this study, the optical parametric amplification (OPA) process of laser radiation in magnesium oxide-doped lithium tantalate (MgO:LiTaO3) crystal was numerically simulated using MATLAB software. The research focused on identifying the key limiting factors in signal wave amplification within the infrared spectral range, taking into account linear absorption, third-order nonlinearity, and dispersion effects. The results demonstrated that dispersion significantly limits amplification efficiency when the pulse duration is below 10 fs, while absorption becomes the dominant limiting factor when the crystal thickness exceeds 1.2 mm. These findings pave the way for the development of advanced optical amplifiers for telecommunications and ultrashort-pulse laser systems, distinguishing this material from conventional alternatives such as BBO.
Background. To derive an analytical expression for the signal wave efficiency considering domain thickness variations and nonlinear effects, and to propose a new approach for optimizing frequency conversion in MgO:LiTaO3.
Materials and methods. The reduced nonlinear coupled-wave equations under quasi-phase matching (QPM) conditions were solved using the split-step method, the fourth-order Runge–Kutta algorithm, and fast Fourier transforms (FFT).
Results. When the pulse duration is shorter than 10 fs, dispersion reduces the efficiency by 15–20%, while absorption leads to losses of up to 30% when the crystal thickness exceeds 1.2 mm.
Conclusion. The derived analytical expression serves as a foundation for optimizing the OPA process in MgO:LiTaO3 and paves the way for the development of novel optical amplifiers that can enhance efficiency by up to 50% in telecommunications and ultrashort-pulse laser systems.
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