Reliability of Double Clad Fiber Coatings for Fiber Lasers

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Fiber lasers for industrial, military, scientific and medical applications are now ubiquitous. Active and passive fibers are used in fiber lasers as gain media, for numerous fiber-based components and for beam delivery. To date, much of the discussion on reliability of fiber lasers has been focused on diode and fiber reliability. In the regime of fiber reliability, attention has primarily been given to photo-darkening of the double-clad fibers used as gain media. Low-index polymer coatings are key in guiding the pump light, and their mechanical and environmental reliability has not received due attention.