Drawing of single-crystal and glass-clad lithium tantalate fibers by the laser-heated pedestal growth method

S. C. Pei, T. S. Ho, T. M. Tai, L. M. Lee, J. C. Chen, A. H. Kung, F. J. Kao, S. L. Huang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Lithium tantalate (LT) single-crystalline fibers with various growth conditions were obtained using the laser-heated pedestal growth (LHPG) method. The fibers can be produced with a diameter down to 70 m and tens of centimetres in length by using different pulling rates. Preliminary experiments also showed that the LT fibers can be electrically poled for quasi-phase matching. To facilitate wave propagation with low loss, glass-clad LT fibers were fabricated by a co-drawing LHPG method for the first time. A vacuum apparatus was developed to eliminate the bubbles from incongruent evaporation of lithium oxide during the drawing of the glass-clad LT fibers. The glass-clad fibers are classified into two different categories by the measurements of refractive index profiles. One is a step-index fiber and the other is a graded-index fiber. Both fiber types are multimode at present, but single-mode LT fibers could be fabricated with the high-precision control of the LHPG systems.

Original languageEnglish
Pages (from-to)48-52
Number of pages5
JournalJournal of Applied Crystallography
Volume43
Issue number1
DOIs
StatePublished - 2010

Keywords

  • Glass-clad materials
  • Laser-heated pedestal growth
  • LiTaO waveguide

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