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A theoretical study of a Ti-diffused Er:LiNbO3 waveguide laser

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6 Author(s)
Delong Zhang ; Dept. of Precision Instrum. Eng., Tianjin Univ., China ; Caihe Chen ; Jiang Li ; Guilan Ding
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A detailed theoretical procedure of determining the mode sizes of fundamental mode field distribution in a coaxially pumped Ti-diffused Er:LiNbO3 waveguide laser has been described. The mode sizes, effective refractive indexes, effective pump area, and coupling efficiency as a function of the initial Ti stripe width W were numerically calculated for the waveguide with 95- and 100-nm initial Ti stripe thicknesses, respectively. The results indicated that the threshold pump power is severely affected by the stripe width, while slope efficiency is hardly changed as W; both show little difference between 95- and 100-nm stripe thickness. In addition, the stimulated emission cross section of Er3+ in Er:LiNbO3 channel waveguide versus the wavelength were calculated directly from its fluorescence spectra using the β-τ method. Subsequently, threshold pump power and slope efficiency were evaluated

Published in:

IEEE Journal of Quantum Electronics  (Volume:32 ,  Issue: 10 )