Abstract
Tm3+-doped LiNbO3 channel waveguides have been fabricated by Zn-diffusion from the vapour phase following a two step procedure. The waveguides have a depth of around 6.5 µm in both polarizations (TM and TE), being multimode at 632.8 nm and single mode at around 2 µm. The spectroscopic properties of the active ions in the waveguides have been explored and compared with that in bulk. The results indicate that Zn-diffusion does not introduce important changes in the optical features of Tm3+ ions, being an adequate technique to produce optical waveguides based on this material.
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