Abstract
A theoretical model to describe Holmium-doped fiber lasers pumped by Laser-diodes
around 1.125 μm is presented. With considerations of important energy transfer
processes, such as laser re-absorption, cross-relaxation (CR), energy transfer
upconversion (ETU), and excited state absorption (ESA), good agreement is achieved
between the simulations and experimental measurements. The ESA process is found playing
an important role to the fiber laser performance, and the CR and ETU processes make a
negative contribution to the lasers. On the basis of the model, optimization of the
lasers threshold and slope efficiency as well as output power on the length of active
media, the output coupling, pump wavelength, and Ho$^{3+}$ ions concentration are
investigated. It is found that lower doping concentration (about 5000 ~ 10000 ppm) for
the fiber lasers is preferred for efficient operation.
© 2012 IEEE
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