Spectral line broadening mechanism of Er3+ transitions in Er:Ti:LiNbO3 channel waveguides |
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| Authors: | V Dierolf AB Kutsenko A Ostendorf Chr Sandmann |
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| Institution: | Fachbereich Physik, Universit?t Paderborn, 33095 Paderborn, Germany, DE
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| 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.
Received: 24 May 2001 / Published online: 23 October 2001 |
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| Keywords: | PACS: 42 82 Et 71 70 Ch 77 84 Dy |
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