26 February 2013 High-efficiency (6+1)x1 combiner for high power fiber lasers and amplifiers
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We have developed a (6+1)x1 combiner for fiber lasers and amplifiers based on a glass fusion technology. We have combined a conventional fiber fusion technology for pump channels with a new design for a single mode signal channel, which utilizes a vanishing core technology. The approach has been developed for single channel spot size converters and pitch reducing optical fiber arrays (PROFAs). Flexibility of this technology allows a custom design to match both a single or large mode area fiber at the input and a required active fiber at the output. The technology allows two parameters, mode field diameter (MFD) and taper diameter or channel spacing to be adjusted independently resulting in low loss coupling for signal channel at input and output. Utilizing this approach we have obtained better than 0.3 dB coupling for a signal channel at 1550 nm with a standard SMF28 fiber at the input and an active fiber at the output, while using six conventional 105/125 micron fibers as pump channels operating at 974 nm efficiently coupled to a double-clad fiber. Low signal loss results in high efficiency lasing or amplification suitable for high power applications. This unique technology allows excellent coupling for the signal channel as well as for the pump channels and is amenable to even more pump channels if desired.
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Dan Neugroschl, Dan Neugroschl, Jongchul Park, Jongchul Park, Mitchell Wlodawski, Mitchell Wlodawski, Jonathan Singer, Jonathan Singer, Victor I. Kopp, Victor I. Kopp, "High-efficiency (6+1)x1 combiner for high power fiber lasers and amplifiers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860139 (26 February 2013); doi: 10.1117/12.2005747; https://doi.org/10.1117/12.2005747

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