Injection-locked highly Yb3+-doped uncoupled-61-core phosphate fiber laser

Lizhu Li, Xiushan Zhu, Junfeng Wang, Jie Zong, Maohe Li, Jason Meyer, Arturo Chavez-Pirson, Mehmetcan Akbulut, Robert A. Norwood, Nasser Peyghambarian

Research output: Contribution to journalArticlepeer-review


Uncoupled multicore fibers are promising platforms for advanced optical communications, optical computing, and novel laser systems. In this paper, an injection-locked highly ytterbium (Yb3+)-doped uncoupled-61-core phosphate fiber laser at 1030 nm is reported. The 61-core fiber with a core-to-core pitch of 20 µm was fabricated with the stack-and-draw technique. Each core doped with 6-wt.% Yb3+ ions has a diameter of 3 µm and numerical aperture of 0.2. Linearly polarized single-frequency output of 9.1 W was obtained from the injection-locked cavity with a 10-cm-long gain fiber at a pump power of 23.6 W. The injection locking of all 61 cores was confirmed by inspecting the longitudinal modes of the individual lasers with a scanning Fabry–Perot interferometer. The performance of the injection-locked 61-core fiber laser was characterized and compared to that of the free-running operation in terms of optical spectrum, near- and far-field intensity profiles, and relative intensity noise.

Original languageEnglish (US)
Pages (from-to)590-593
Number of pages4
JournalOptics letters
Issue number3
StatePublished - Feb 1 2023

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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