A double-die modification of micro-pulling-down method for in situ clad/core doping of fiber crystal

Boris M. Epelbaum, Katsuhiko Inaba, Satoshi Uda, Kiyoshi Shimamura, Minoru Imaeda, Vladimir V. Kochurikhin, Tsuguo Fukuda

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A novel technique for single-crystal fibers cladding immediately in the course of the growth process based on the micro-pulling-down (μ-PD) method has been proposed and verified. The principle of the double-die-μPD implies that the capillary nozzle provides capillary feeding to the growing fiber simultaneously from the inner pipe channel with undoped melt and from the outer surface with doped melt. The menisci shape, melt flow outside the nozzle, control of the doped/undoped melt ratio and process stability are discussed in terms of capillarity. Examples of practical crucible design are discussed in connection with radial dopant distribution. Mn-doped lithium niobate fiber, 0.5 and 0.7 mm in diameter, having 40-60 μm doped outer area were grown successfully.

Original languageEnglish
Pages (from-to)559-566
Number of pages8
JournalJournal of Crystal Growth
Volume179
Issue number3-4
DOIs
Publication statusPublished - 1997 Aug

Keywords

  • Cladding
  • Dopant distribution
  • Fiber crystal
  • Lithium niobate
  • Melt
  • Micro-pulling-down method

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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