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Proceedings Paper

High-quality waveguides by reverse proton exchange in stoichiometric lithium tantalate
Author(s): Marco Marangoni; Roberto Osellame; Roberta Ramponi; Shunji Takekawa; Masaru Nakamura; Kenji Kitamura
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Paper Abstract

This paper reports the development and modelling of the reverse-proton-exchange process for the realization of high quality optical waveguides in MgO doped stoichiometric lithium tantalate, a promising nonlinear material due to its low coercive field and high damage threshold. Reverse-proton-exchange gives rise to a buried refractive index-profile providing significant advantages in terms of attenuation, insertion losses and overlap of the fields interacting through the nonlinear susceptibility. By characterizing several samples fabricated under different experimental conditions, we identified a fabrication procedure which is simpler than the conventional one used for lithium niobate: the annealing and reverse-exchange processes are indeed performed at the same temperature so that the diffusion of hydrogen ions towards the substrate during the reverse-exchange occurs in the same conditions as during the annealing. This results in very simple empirical laws relating the fabrication to the optical parameters. By such a modeling we defined fabrication parameters giving rise to a single-mode waveguide at l=1.55mm with good fiber mode-matching and high efficiency when used as a nonlinear device for telecom applications.

Paper Details

Date Published: 18 August 2004
PDF: 8 pages
Proc. SPIE 5451, Integrated Optics and Photonic Integrated Circuits, (18 August 2004); doi: 10.1117/12.545459
Show Author Affiliations
Marco Marangoni, INFM (Italy)
Politecnico di Milano (Italy)
Istituto Fotonica e Nanotecnologie/CNR (Italy)
Roberto Osellame, INFM (Italy)
Politecnico di Milano (Italy)
Istituto Fotonica e Nanotecnologie/CNR (Italy)
Roberta Ramponi, INFM (Italy)
Politecnico di Milano (Italy)
Istituto Fotonica e Nanotecnologie/CNR (Italy)
Shunji Takekawa, National Institute for Materials Science (Japan)
Masaru Nakamura, National Institute for Materials Science (Japan)
Kenji Kitamura, National Institute for Materials Science (Japan)


Published in SPIE Proceedings Vol. 5451:
Integrated Optics and Photonic Integrated Circuits
Giancarlo C. Righini; Seppo Honkanen, Editor(s)

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