Mode decomposition of Kerr self-cleaned beams by phase only SLM

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

Graded-index multimode optical fibers have recently attracted a renewed attention, thanks to the discovery of new nonlinear effects, such as Kerr beam self-cleaning. In essence, Kerr self-cleaning involves a flow of the propagating beam energy into the fundamental mode of the fiber, accompanied by a redistribution of the remaining energy among high-order modes. Increasing the fundamental mode energy leads to a significant improvement of the output beam quality. A standard method to determine beam quality is to measure the M2 parameter. However, since self-cleaning involves the nonlinear redistribution of energy among a large number of fiber modes, measuring a single beam quality parameter is not sufficient to characterize the effect. A properly informative approach requires performing the mode decomposition of the output beam. Mode decomposition permits to evaluate the energy distribution among all of the excited fiber modes, which enables investigations of nonlinear mode coupling processes at a qualitatively new level. In this work, we demonstrate an efficiency mode decomposition method based on holography, which is suitable for analyzing the self-cleaning effect. In a theoretical study, we describe the solution of the mode decomposition problem for the modes of the graded-index multimode fiber. In an experimental investigation, we demonstrate the decomposition of both low-power (speckled) and self-cleaned beams, involving more than 80 modes.

Original languageEnglish
Title of host publicationReal-time Measurements, Rogue Phenomena, and Single-Shot Applications VI
EditorsDaniel R. Solli, Georg Herink, Serge Bielawski
PublisherSPIE
ISBN (Electronic)9781510641778
DOIs
Publication statusPublished - 2021
EventReal-time Measurements, Rogue Phenomena, and Single-Shot Applications VI 2021 - Virtual, Online, United States
Duration: 6 Mar 202111 Mar 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11671
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceReal-time Measurements, Rogue Phenomena, and Single-Shot Applications VI 2021
CountryUnited States
CityVirtual, Online
Period06.03.202111.03.2021

Keywords

  • Beam characterization
  • GRIN multi-mode fibers
  • Mode decomposition
  • Spatial light modulation

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