Source:http://linkedlifedata.com/resource/pubmed/id/12152944
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
7
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| pubmed:dateCreated |
2002-8-2
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| pubmed:abstractText |
This paper describes the first demonstration for feeding back the results obtained by the line-focus-beam ultrasonic material characterization (LFB-UMC) system to the crystal growth conditions for optical-grade LiTaO3 crystals and for achieving much improved homogeneity of chemical composition. We evaluated a commercially available optical-grade LiTaO3 single crystal with a nominally congruent composition in detail, by measuring distributions of the velocities of leaky surface acoustic waves (LSAW) along the Y-axis direction for a Z-cut specimen plate prepared from the crystal grown in the Y-axis direction. We detected an increment of 0.66 m/s in LSAW velocity along the pulling axis direction corresponding to 0.024 mol% in Li2O content, and the compositional gradient was +0.346 x 10(-3) (Li2O-mol%)/mm. By experimentally obtaining the starting material composition dependence of the gradients, we developed a method of estimating the proper composition ratio that would lead to a more homogeneous crystal. We grew a new crystal with a Li2O content of 48.47 mol%, resulting in a very small compositional gradient of +0.046 x 10(-3) (Li2O-mol%)/mm and a compositional homogeneity of less than 0.012 Li2O-mol% in a Z-cut area of 50 mm x 50 mm used for device substrates.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Jul
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| pubmed:issn |
0885-3010
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:volume |
49
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
905-14
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| pubmed:dateRevised |
2003-11-3
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| pubmed:year |
2002
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| pubmed:articleTitle |
Evaluation and improvement of optical-grade LiTaO3 single crystals by the LFB ultrasonic material characterization system.
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| pubmed:affiliation |
Department of Electrical Engineering, Tohoku University, Sendai, Japan. kushi@ecei.tohoku.ac.jp
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| pubmed:publicationType |
Journal Article
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