Analytical Model of a Holmium-doped Fiber Laser Including Up-conversion Transition

Abstract This paper presents theoretical investigation of a holmium-doped fiber laser. Analytical model is developed to consider the effect of up-conversion transition on the laser performance. In this model, the core pumped system is simulated at in-band pumped scheme to optimize the fiber length, pump wavelength, pump power threshold and laser wavelength. A good agreement is achieved between the simulation findings and the experiment results. The results indicate the negative effect of up-conversion transitions on the performance of holmium-doped fiber lasers via reducing the laser efficiency. Understanding the impact of this interaction is helpful to describe the reason for obtaining a lower laser efficiency than expected in experimental reports of holmium-doped fiber lasers pumped at 1.95µm wavelength region. The developed model is suggested as valid tools to simulate and optimize any rare-earth doped fiber lasers and amplifiers.