Design of a Diode-Pumped Yb:YAG Rod Laser with High Efficiency by Using a Diffusive Optical Cavity

概要

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A diode-pumped Yb:YAG rod laser is designed using a fivefold symmetric diffusive optical cavity to improve the pump absorption efficiency of the pump power. By using a ray-tracing method, the optimum design parameters for the doping density, the radius of the diffusive optical cavity, and the radius of the crystal rod are determined by analyzing the absorbed pump power, the distribution profile of the absorbed power, and the threshold absorbed pump power. Based upon these analyses, we show that a highly efficient Yb:YAG rod laser is feasible with the fivefold symmetric diffusive optical cavity. The pump absorption efficiency of 63.6%, which is calculated for the optimal design parameters, corresponds to a 2.4 times improvement in comparison to that obtained by Sumida et al. [Laser Focus World (June, 1999) 63]. By using the absorbed power distribution, we achieved a more realistic quasi-three-level laser output power calculation. In addition, we developed a realistic code, utilizing the absorbed power distribution, for calculating the output power of a quasi-three-level laser. For an incident pump power of 600 W, the laser output power is calculated to be 126W with optical-to-optical efficiency of 21% and slope efficiency of 42.9%.
社団法人応用物理学会の論文
2002-07-15