AI Article Synopsis
- Erbium-doped yttrium aluminum garnet (Er:YAG) rods were grown into single-crystal fibers using a laser-heated pedestal growth technique, achieving a 300 μm diameter.
- The growth process created varying distributions of Er dopant ions, which were analyzed using laser-induced fluorescence imaging and compared against thermal diffusion theory.
- This research aims to improve the controlled growth of fibers with optimal properties for high-power optical amplifiers and lasers, focusing on high thermal conductivity and low Brillouin gain.
Article Abstract
Erbium-doped yttrium aluminum garnet (Er: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 Er 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 Y and Er ions at 2000°C, yielding an estimated value of D=(9.10±0.8)×10 m/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.
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| http://dx.doi.org/10.1364/AO.57.000362 | DOI Listing |
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