3D Dynamic Opto-mechanical Modeling of Diode-pumped Trapezoid Yb:YAG/YAG Thin Disk Laser

We present a 3D modeling of thermal lensing effect in an edge-pumped trapezoid Yb:YAG/YAG thin disk laser. At first, a Monte-Carlo ray tracing method is used to calculate the absorbed pump power from four sides in such a way that the pump light are totally trapped inside the crystal after total reflections. Secondly, we optimized the absorption efficiency of our laser which is obtained 66.7% with Yb:YAG dopant of 10% and efficient thickness of 0.2mm. Then, using the result of absorbed pump light distribution to compute temperature distribution inside the crystal and fulfill the consequence of opto-mechanical properties including Von Mises stress and deformation components distribution inside the crystal via Finite Element Analysis (FEA). Furthermore, the thermal lens power is considered in our modeling as an important consequence of opto-mechanical effect and compared in different output powers. Finally, we applied the Dynamic Multimode Analysis (DMA) method to solve the rate equation and calculate the output powers respect to different length of cavities and different output coupler curvatures respect to the dealing beam quality in multimode operation. KeywordsYtterbium laser; Thermal effects; Solid-state laser; Diode-pumped laser