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Photodarkening (PD) in optical fibers is a serious concern for the development and maintenance of the reliable operation of high-power ytterbium fiber lasers (YDFL), over a long period of time. Formation of colour centres in the silica glass host is often believed to be the reason behind PD [1]. Yb-doped aluminosilicate fiber suffers PD as a permanent excess optical loss (unless optically or thermally...
Photodarkening in highly Yb-doped aluminosilicate and phosphosilicate fibers, under 488 nm irradiation, is presented. Both irradiation-induced excess loss and post-irradiation temporal loss evaluations reveal that Yb-doped phosphosilicate fiber is highly resistant to photodarkening.
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