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Characterization of vapor diffused Zn:LiTaO3 optical waveguides

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2 Author(s)
Yoon, D.W. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Eknoyan, O.

Diffusion and optical properties of planar waveguides produced in LiTaO3 by a recently developed technique that utilizes Zn diffusion from vapor phase are presented. The waveguides are obtained by 6-h diffusion at temperatures as low as 800°C. The results indicate that Zn is a fast diffusant in LiTaO3 and has activation energies that are slightly less than those for Ti diffusion into LiTaO 3. The diffusion temperatures for Zn are much lower than the 1150-1200°C require for Ti metal indiffusion. The diffusion coefficient of Zn at 800°C, is comparable to that of Ti at 1200°C. The resulting waveguides support both ordinary and extraordinary modes of polarization. The low temperature diffusion slows out diffusion and has been shown to be advantageous for making low-loss optical waveguides in LiTaO3

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Lightwave Technology, Journal of  (Volume:6 ,  Issue: 6 )