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Title: Mode selection in large-mode-area step-index multicore fiber laser and amplifier
Authors: Sidharthan, Raghuraman
Ji, Junhua
Xia, Nan
Zhou, Yanyan
Zang, Jichao
Huang, Xiaosheng
Lai, Wenn Jing
Benudiz, Yehuda
Ami, Udi Ben
Ishaaya, Amiel A.
Yoo, Seongwoo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Sidharthan, R., Ji, J., Xia, N., Zhou, Y., Zang, J., Huang, X., Lai, W. J., Benudiz, Y., Ami, U. B., Ishaaya, A. A. & Yoo, S. (2020). Mode selection in large-mode-area step-index multicore fiber laser and amplifier. IEEE Photonics Technology Letters, 32(12), 722-725.
Journal: IEEE Photonics Technology Letters
Abstract: We present mode-selection in a laser and an amplifier from a multicore Ytterbium (Yb) doped step-index fiber with six large mode area and low numerical aperture (NA) cores, fabricated using a combination of chelate delivery system (CDS) and stack and draw technique. The six cores are placed in a ring shape with each core having a diameter of 19&tild; μ {m} and NA of 0.068, or V-number of 3.8 at 1.06&tild; μ {m}. The cores are placed with a 1.1 pitch-to-core ratio, which efficiently promotes supermode generation and creates a good modal separation to facilitate mode selection. Mode selection of the multicore fiber is investigated in a laser as well as an amplifier configuration. With an intracavity pinhole, we are able to select the fundamental in-phase supermode for lasing up to 33.9W output power with a 52% slope efficiency. In the amplifier configuration, a Gaussian beam from a seed source is successfully coupled to the fundamental supermode in the multicore fiber. The seed source is amplified to 43.5W from 0.14 W input power.
ISSN: 1941-0174
DOI: 10.1109/LPT.2020.2992031
Rights: © 2020 Institute of Electrical and Electronics Engineers (IEEE). All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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