Single crystal Er3+: YAG fibers with tailored refractive index profiles

L. Cheng, T. Chick, J. Chapman, E. F.C. Dreyer, C. D. Nie, S. Bera, J. A. Harrington, And S.C. Rand

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Erbium-doped yttrium aluminum garnet (Er3:YAG) rods were inserted inside undoped tubes and grown into single-crystal fibers of a diameter of 300 μm using the laser-heated pedestal growth technique. Growth at various rates resulted in radially graded distributions of Er3 dopant ions, as observed using laser-induced fluorescence imaging. Profiles of the refractive index were measured using cross-sectional reflectometry in a microscope. Dopant distributions and the corresponding index profiles were compared with thermal diffusion theory to determine the inter-diffusion coefficient of Y3 and Er3 ions at 2000°C, yielding an estimated value of D 9.10 0.8 × 10−11 m2∕s. This work constitutes a step toward controlled growth of fibers with high thermal conductivities, low Brillouin gain, and waveguiding properties required for high-power optical amplifier and laser applications.

Original languageEnglish (US)
Pages (from-to)362-370
Number of pages9
JournalApplied Optics
Issue number2
StatePublished - Jan 10 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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