In this paper we demonstrate up-conversion emission at 550 nm into an Er-doped Ti:LiNbO3 waveguide pumped by a 980 nm laser diode. The two main processes of the up-conversion are the Sequential Two Photon Absorption (STPA)and the Energy Transfer (ET). In our case, the fluorescence lifetime ofthe 4S312 energy level of the Er3 ion is measured as 32 .ts. The fluorescence spectrum shows two peaks around 550 nm and 558 am which are strongly polarisation dependent. This effect is attributed to the different crystal fields induce by the location of Er3 ions in the different LiNbO3 crystal lattices. The variations of the of fluorescence intensity and the transmitted pump power are Studied versus the length of Er-doped waveguide. The fluorescence intensity has a quadratic behaviour versus the coupled pump power which demonstrate that the up-conversion mechanism is mainly due to a STPA process.
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