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Electro-optic coefficients of a non-congruent lithium niobate fabricated by vapour transport equilibration: Composition effect.
- Source :
- Opto-Electronics Review; Jun2017, Vol. 25 Issue 2, p89-92, 4p
- Publication Year :
- 2017
-
Abstract
- Composition effect on electro-optic (EO) properties of a LiNbO<subscript>3</subscript> (LN) single-crystal has been investigated in a Li<subscript>2</subscript>O-content range of 47.0-49.95 mol%. Some non-congruent LN crystals with different Li<subscript>2</subscript>O-contents were prepared by performing Li-deficient or Li-rich vapour transport equilibration treatments on as-grown congruent LN crystals. Unclamped EO coefficients γ<subscript>13</subscript> and γ<subscript>33</subscript> of these samples were measured by a Mach-Zehnder interferometric method. The measurements show that in the Li-deficient regime both γ<subscript>13</subscript> and γ<subscript>33</subscript> increase by ~8% as Li<subscript>2</subscript>O-content decreases from the congruent 48.6 mol% to the 47.0 mol% in the Li-deficient regime. The feature is desired for the EO application of the Li-deficient crystal. In the near-stoichiometric regime, both γ<subscript>13</subscript> and γ<subscript>33</subscript> reveal a non-monotonic dependence. As the Li<subscript>2</subscript>O-content increases from the 48.6 mol%, the EO coefficient decreases. Around Li<subscript>2</subscript>O-content 49.5 mol%, a minimum is reached. After that, the EO coefficient recovers slowly. At the stoichiometric composition, it recovers to a value close to that at the congruent point. Comparison shows that different crystal growth methods give rise to different defect structure features and hence different composition effects. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 12303402
- Volume :
- 25
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Opto-Electronics Review
- Publication Type :
- Academic Journal
- Accession number :
- 128625224
- Full Text :
- https://doi.org/10.1016/j.opelre.2017.04.001