Modelling of Tm3+-doped LiNbO3 waveguide lasers

摘要

In this work, CW laser operation of Tm3+- doped LiNbO3 channel waveguides has been modelled. The model is based on time dependent laser rate equations coupled with the laser signal and pump photon flux equations. Steady state solutions for the population densities, pump and signal powers are obtained by using finite difference discretization of the active volume. The effects of spectroscopic parameters such as concentration dependent cross-relaxation and excess waveguide loss have been analyzed. We demonstrate good agreement with experimental data previously reported in Zn-diffused LiNbO3:Tm(3+)channel waveguide lasers. It is shown also that laser performance can be substantially improved by optimizing the cavity length.