Mode Selection in Large-Mode-Area Step-Index Multicore Fiber Laser and Amplifier

Raghuraman Sidharthan, Junhua Ji, Nan Xia, Yanyan Zhou, Jichao Zang, Xiaosheng Huang, Wenn Jing Lai, Yehuda Benudiz, Udi Ben Ami, Amiel A. Ishaaya, Seongwoo Yoo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish
Article number9085398
Pages (from-to)722-725
Number of pages4
JournalIEEE Photonics Technology Letters
Volume32
Issue number12
DOIs
StatePublished - 15 Jun 2020

Keywords

  • Multicore fiber
  • fiber amplifier
  • large mode area fiber laser
  • six-core fiber
  • supermode

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