Estimation of refractive index profile of a GeO2-SiO2 graded-index fiber from the elemental composition
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Summary
This summary is machine-generated.We developed methods to estimate the refractive index profile of germanium dioxide-silicon dioxide graded-index fibers (GIFs) using elemental composition. Our approaches bridge discrepancies between measured composition and refractive index, enabling GIF profile generation for various applications.
Area Of Science
- Materials Science
- Optical Fiber Technology
- Glass Science
Background
- Graded-index fibers (GIFs) are crucial optical components with precisely controlled refractive index profiles.
- Accurate estimation of the refractive index profile from elemental composition is essential for GIF design and manufacturing.
- Existing methods face challenges in reconciling elemental composition with measured refractive index profiles in binary glass systems.
Purpose Of The Study
- To propose and validate novel methods for estimating the refractive index profile of GeO2-SiO2 GIFs from their elemental composition.
- To address the discrepancy observed between elemental composition (via EDS/EPMA) and refractive index profiles.
- To provide practical approaches for generating GIF index profiles across a wide wavelength range.
Main Methods
- Measured the mole fraction of GeO2 as a function of radial position using energy dispersive spectroscopy (EDS) and electron probe microanalysis (EPMA).
- Determined refractive index profiles of a commercial GIF (Thorlabs GIF625) at multiple wavelengths.
- Developed two empirical approaches: the effective mole fraction approach and the density parameter approach.
Main Results
- A discrepancy was identified between GeO2 mole fractions derived from refractive index profiles and direct elemental analysis.
- The proposed empirical approaches successfully bridged the gap between elemental composition and refractive index profiles.
- Index profile parameters were generated for wavelengths spanning visible to near-infrared (2.0 µm) using the developed methods.
Conclusions
- The proposed methods provide a reliable way to estimate refractive index profiles of GeO2-SiO2 GIFs from elemental composition.
- These approaches can be extended to other binary glass system GIFs, enhancing their applicability in optical systems.
- Accurate index profile generation is facilitated, supporting the development of advanced optical fiber technologies.
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