On the origin of photodarkening resistance in Yb-doped silica fibers with high aluminum concentration
| Autor: | Peter D. Dragic, Matthew Tuggle, Courtney Kucera, John Ballato, Magnus Engholm, Thomas Hawkins |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Ytterbium
Materials science Doping Analytical chemistry chemistry.chemical_element 02 engineering and technology Chemical vapor deposition 021001 nanoscience & nanotechnology Laser 01 natural sciences Electronic Optical and Magnetic Materials law.invention 010309 optics Core (optical fiber) chemistry Aluminium law Fiber laser Physical Sciences 0103 physical sciences Photodarkening Fysik 0210 nano-technology |
| Zdroj: | Optical Materials Express. 11:115 |
| ISSN: | 2159-3930 |
| DOI: | 10.1364/ome.413766 |
| Popis: | Ytterbium (Yb) doped silica fibers are widely used in high power fiber lasers where co-doping the silica core material with other elements is pivotal for high efficiency, low detrimental effects, and reliable optical properties. Aluminum (Al) is one of the most preferred co-dopants, yet, purely Yb/Al-doped silica fibers suffer from relatively high levels of photodarkening (PD) when used in laser applications. A slightly improved PD-resistance has been reported for increasing Al-doping concentration. However, the source of this improved performance is still unknown. In this article, we present the origin of the improved PD-resistance observed in Yb-doped silica fibers with high Al-concentration. It is found that a high Al-co-doping concentration reduces the interaction strength between the Yb-ion and nearby oxygen ions, resulting in a significant PD-resistance with negligible induced loss in the entire visible spectral range. A negligible PD is observed even for significantly higher Yb-concentrations than commonly used in commercially available Yb-doped silica fibers. |
| Databáze: | OpenAIRE |
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