Fluoride-fiber-based side-pump coupler for high-power fiber lasers at 2.8 μm

C. A. Schäfer, H. Uehara, D. Konishi, S. Hattori, H. Matsukuma, M. Murakami, S. Shimizu, S. Tokita

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


A side-pump coupler made of fluoride fibers was fabricated and tested. The tested device had a coupling efficiency of 83% and was driven with an incident pump power of up to 83.5 W, demonstrating high-power operation. Stable laser output of 15 W at a wavelength of around 2.8 μm was achieved over 1 h when using an erbium-doped double-clad fiber as the active medium. To the best of our knowledge, this is the first time a fluoride–glass-fiber-based side-pump coupler has been developed. A test with two devices demonstrated further power scalability.

Original languageEnglish
Pages (from-to)2340-2343
Number of pages4
JournalOptics Letters
Issue number10
Publication statusPublished - 2018 May 15


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