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Crystal Growth and Optical Properties of Er-doped Near Stoichiometric Lithium Niobate

Er-doped near stoichiometric lithium niobate(Er:SLN) crystal with good optical quality has been grown by Czochralski method.The as-grown crystal is 35mm in diameter and 25mm in length.When the Judd-Ofelt theory of parity-forbidden electric-dipole transitions of rare earth ions on non-centrosymmetric sites is applied to Er:NSLN,it results in a good fit on the absorption of the crystal.The three intensity parameters Ωt are fitted at t=2,4,6 respectively,Ω2=5.37×10-20cm2,Ω4=2.98×10-20cm2,Ω6=1.92×10-20cm2.The spectral parameters radiative transition probabilities AJ,J',oscillator strengths P J,J',the radiative lifetime τ and the fluorescence branch ratio βJ' are also obtained.The result of this experiment is dicussed.