Abstract
In order to elucidate the interaction effects among the various defects present in a LiNbO3-based integrated optical device, we investigated the change of the optical properties of Er3+ ions under the application of an external electric field and hydrostatic pressure. We obtained for stoichiometric bulk material a complete picture of the field-induced spectral shifts as a function of transition and site. As a first important application of these results we were able to clarify the mechanism of spectral broadening of the Er3+ transitions in Ti:Er:LiNbO3 channel waveguides. By selecting different waveguide modes for excitation and using highly selective double-resonance excitation with two lasers, we found that the [Ti4+] concentration gradient caused by the indiffusion results in an internal E-field gradient. This translates, due to the averaging within the guided mode, into mode-dependent spectral line broadening.
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Received: 24 May 2001 / Published online: 23 October 2001
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Dierolf, V., Kutsenko, A., Ostendorf, A. et al. Spectral line broadening mechanism of Er3+ transitions in Er:Ti:LiNbO3 channel waveguides. Appl Phys B 73, 443–448 (2001). https://doi.org/10.1007/s003400100692
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DOI: https://doi.org/10.1007/s003400100692