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Second-order optical non-linearity of proton exchanged lithium tantalate waveguides
KTH, Superseded Departments, Physics.ORCID iD: 0000-0001-7688-1367
2001 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 73, no 06-maj, 519-522 p.Article in journal (Refereed) Published
Abstract [en]

A detailed correlation between the fabrication conditions, crystallographic phase state of HxLi1-xTaO3 waveguides and second-order optical non-linearity has been investigated by using reflected SHG measurements from the polished waveguide end face. The non-linearity, strongly reduced after the initial proton exchange, is found to be restored and even increased after annealing. However, this apparent increase in the non-linearity is accompanied by a strong degradation of the quality of the SHG reflected beam in the region of the initial as-exchanged waveguide due to beam scattering. The high temperature proton exchange technique has been shown to produce high-quality alpha -phase waveguides with essentially undegraded non-linear optical properties. There is no phase transition when the alpha -phase waveguides are fabricated by direct exchange. This phase presents the same crystalline structure as that of LiTaO3 and maintains the excellent non-linear properties of the bulk material. The results obtained are important for the design fabrication and optimization of guided-wave non-linear optical devices in LiTaO3.

Place, publisher, year, edition, pages
2001. Vol. 73, no 06-maj, 519-522 p.
Keyword [en]
refractive-index profiles, wave-guides, cut litao3, phases
URN: urn:nbn:se:kth:diva-21141ISI: 000172488700018OAI: diva2:339838
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2015-03-30Bibliographically approved

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Laurell, Fredrik
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