Wu Chunting

Thermal analysis of double-end-pumped Tm:YLF laser

Based on the steady heat conduction equation, LD double-end-pumped anisotropic Tm:YLF crystal temperature field analytical expression and thermal focal length are obtained by the integral-transform method. The influence of pump conditions and crystal parameters on the distribution of temperature and thermal focal length are quantitatively analyzed. The simulation results showed that increasing the pump power, decreasing waist radius, increasing doping concentration or decreasing crystal length, the temperature rise of crystal and nonuniformity of the thermal distortion are intensified, the corresponding thermal effects enhance, the thermal focal length gets shorter. The anisotropic of the physical and optical parameter of Tm:YLF crystal leads to the anisotropic of thermal effect. When the product of crystal length and doping concentration is a constant value, the thermal focal length keeps a basic consistent.