Research on output characteristics of continuous-wave operation of Ho:YAG laser pumped by Tm:YLF laser

It report a continuous wave Ho:YAG laser pumped by1.91 μm Tm Laser. It important to thesis analyzed the output characteristics of Ho laser pumped by continuous Tm laser.The rate equation of Ho laser in continuous-wave operation was put forward. The rate equation was solved to analyze the influence of upconversion effect to the output power, slope efficiency and threshold power in CW operation .The transition branching ratio between the energy levels was taken into consideration while discussing the influence of up conversion.Through the simulation analysis on the output characteristics, consider the influence of upconversion effect than to ignore the influence of upconversion effect, The threshold power increased by 0.34W, the highest output power of the reduced 2.89W, the slope efficiency was decreased by 16.1%.Respectively，For all the experiments, the Tm:YLF laser crystal keeps 292K and the temperature control method is water cooling. When we applied L shape plano concave resonator, the length of the resonator is100mm, the radius of curvature output mirror is 150mm and the temperature of theHo:YAG laser crystal is 292K, we observed the central laser wavelength is 2.09μm. The highest output power reaches 8.23W when the totally input pump power is18W. And the slope efficiency is 45.7%, respectively. The experimental results are coincide with the theory.