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Optimum wavelength determination in an Yb3+ silica fiber laser pumped Pr3+-doped fluoride fiber upconversion laser

Numerical models have been developed to optimize a Pr3+-doped fluoride fiber upconversion laser pumped by an Yb3+-doped silica fiber laser. Numerical and experimental results of optimizing the wavelengths in the system are presented. It is found that the optimum lasing and pump wavelengths of the Yb fiber laser are largely determined by the peak ground state absorption cross section and power ratio respectively. The optimum power ratio is different for different praseodymium lasing wavelengths.