Počet záznamů: 1
Efficient approach to designing low OH diffusion in the thermally shaped double-clad fibers
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SYSNO ASEP 0543286 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Efficient approach to designing low OH diffusion in the thermally shaped double-clad fibers Tvůrce(i) Jasim, Ali (URE-Y)
Peterka, Pavel (URE-Y) RID
Podrazký, Ondřej (URE-Y) RID
Kamrádek, Michal (URE-Y)
Todorov, Filip (URE-Y)
Honzátko, Pavel (URE-Y) RIDCelkový počet autorů 6 Číslo článku 102513 Zdroj.dok. Optical Fiber Technology. - : Elsevier - ISSN 1068-5200
Roč. 63, MAY (2021)Poč.str. 6 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova Double-dad fiber ; CO2 laser ; Optical fiber preform ; Cladding shaping ; High-power fiber lasers ; Multimode fibers Vědní obor RIV BH - Optika, masery a lasery Obor OECD Optics (including laser optics and quantum optics) CEP GA19-03141S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora URE-Y - RVO:67985882 UT WOS 000647686500003 DOI 10.1016/j.yofte.2021.102513 Anotace Hydroxyl groups (OH) penetrate the surface of the fiber preforms as a result of preform processing in the oxyhydrogen flame. Designing double-clad fibers (DCFs) that have a complex noncircular inner-cladding shape with concave and convex edges are possible by shaping their optical preforms thermally with a CO2 laser. Unlike the mechanical technique, the thermal shaping via CO2 laser has paved the way for fabricating DCFs with various inner-cladding geometries that are not limited to the flat edge. However, due to the thermo-physical effects of the CO2 laser on the preform surface, the OH groups are still present in the drawn fibers as they were diffused in the preform while shaping. The OH groups cause attenuation on certain wavelengths that lay rather close to the commonly pumping wavelengths in DCFs. In this work, we have overcome this issue by approaching low OH diffusion in DCFs drawn of thermally shaped optical preforms. This approach was based on treating the preforms with hydrofluoric (HF) acid prior the CO2 laser shaping process in order to remove a thin layer soaked with OH groups. The OH penetration depth was estimated based on the optical attenuation measurement at water peak to be about similar to 600 mu m from preform surface. By etching just 200 mu m of the preform surface followed by laser shaping with ablation depth of 300 mu m can reduce the attenuation attributed to OH groups by 43%. Surface scattering of the inner-clad shaped DCFs drawn of the etched preforms was shown to be low compared to the DCFs drawn of ground preforms. The measurements were carried out in multimode fibers drawn from pure silica Heraeus F300 rods and coated with low index material Pracoviště Ústav fotoniky a elektroniky Kontakt Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Rok sběru 2022 Elektronická adresa https://doi.org/10.1016/j.yofte.2021.102513
Počet záznamů: 1