Showing papers by "Rajib Chakraborty published in 2008"
TL;DR: In this paper, the authors investigated the presence of active erbium in the lattice of LiNbO3 using x-ray photoelectron spectroscopy (XPS), photoluminescence (PL) measurement, and spectroscopic reflectometry.
Abstract: Experimental work on the study of erbium (Er) diffusion and the characterisation of Er-diffused layers required to form waveguide amplifiers in LiNbO3 substrate is presented. The presence of active Er in the lattice of LiNbO3 is investigated using x-ray photoelectron spectroscopy (XPS), photoluminescence (PL) measurement, and spectroscopic reflectometry. The shift of XPS peaks confirms the oxidized state of Er. The PL spectrum shows a sharp peak at 1530-nm wavelength, indicating the 4I15/24I13/2 lasing transition of Er3+. The reflectance spectrum indicates absorption at ~980 and ~1500 nm.
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