Spatial dynamic thermal iteration model for 888Â nm end-pumped Nd:YVO4 solid-state laser oscillators and amplifiers

A new theoretical model, spatial dynamic thermal iteration (SDTI) model, for diode-end-pumped solid-state laser systems is developed, which is both applicable to laser oscillators and amplifiers. The influences of pump beam quality, ground state absorption and depletion (GSA/GSD) and energy transfer upconversion (ETU) are included in our model. According to the basic principles of nonradiative transitions and population dynamics, we can obtain the spatial distribution of heat generation and temperature within the laser crystal through numerically solving heat conduction equation by finite element method (FEM). Furthermore, a spatial mesh iteration algorithm is designed to analyze the temperature dependence of absorption cross section, emission cross section and thermal conductivity. Finally, the simulated results of our SDTI model was proved to precisely coincide with the reported experimental results in classical 888 nm end-pumped Nd:YVO4 laser oscillator and amplifier systems.