49-core rod-type ytterbium-doped multicore fiber for high power operation

Arno Klenke; Mehran Bahri; Albrecht Steinkopff; Christopher Aleshire; Cesar Jauregui; Johannes Nold; Nicoletta Haarlammert; Thomas Schreiber; Jens Limpert

doi:10.1117/12.2649986

8 March 2023 49-core rod-type ytterbium-doped multicore fiber for high power operation

Arno Klenke, Mehran Bahri, Albrecht Steinkopff, Christopher Aleshire, Cesar Jauregui, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, Jens Limpert

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Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000Y (2023) https://doi.org/10.1117/12.2649986
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

We present an Ytterbium-doped, multicore fiber with 7×7 cores. The fiber is realized in a rod-type geometry with step index cores and an air-cladding for pump guiding. Using a segmented-mirror beam splitter followed by a double-pass multicore pre-amplifier and a main-amplifier of 1 m length, the stretched femtosecond input pulses emitted from the frontend system are amplified. The cores of the main amplifier have a mode-field diameter of 28 μm. Operating at 10 MHz repetition rate, a high average power in excess of 1 kW with near single-mode operation is achieved.

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Arno Klenke, Mehran Bahri, Albrecht Steinkopff, Christopher Aleshire, Cesar Jauregui, Johannes Nold, Nicoletta Haarlammert, Thomas Schreiber, and Jens Limpert "49-core rod-type ytterbium-doped multicore fiber for high power operation", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000Y (8 March 2023); https://doi.org/10.1117/12.2649986

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