Investigation of photodarkening in tandem-pumped Yb-doped fibersopen access
- Authors
- Park, Jongseon; Kim, Tae-hyung; Oh, Yejin; Park, Eunji; Kim, Ji Won; Jeong, Hoon
- Issue Date
- Sep-2020
- Publisher
- Optical Society of America
- Citation
- Optics Express, v.28, no.19, pp 27316 - 27323
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- Optics Express
- Volume
- 28
- Number
- 19
- Start Page
- 27316
- End Page
- 27323
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/889
- DOI
- 10.1364/OE.400094
- ISSN
- 1094-4087
- Abstract
- Investigation of photodarkening (PD) in Yb-doped fibers tandem-pumped at 1018 nm is reported. For a homemade Yb-doped aluminosilicate double-clad fiber (YADF), the transmitted power of a 633 nm probe beam is reduced by 2.4% over 2 hours for the tandem pumping configuration at 1018 nm, which is significantly smaller than 33.3% for a laser diode (LD) pumping at 976 nm. A tandem-pumped Yb fiber amplifier also shows a much smaller decrease in the amplified output power over time than a LD-pumped Yb fiber amplifier. Based on fluorescence spectra of the YADF, we can not only associate PD of the YADF to intrinsic oxygen deficiency centers or Tm3+ impurities but also confirm the impact of the excited Yb3+ ion density on PD. The benefits of the tandem pumping in a high-power Yb fiber laser system will be discussed. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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