NDLI: Determination of modal content in multimode fibers by simultaneous intensity and phase measurement

Content Provider	IEEE Xplore Digital Library
Author	Paurisse, M. Hanna, M. Druon, F. Georges, P.
Copyright Year	2009
Description	Author affiliation: Laboratoire Charles Fabry de l'Institut d'Optique Graduate School, CNRS, Univ Paris-Sud, RD128, 91127 Palaiseau, France (Paurisse, M.; Hanna, M.; Druon, F.; Georges, P.)
Abstract	Large-mode-area (LMA) fibers have enabled great advances in high-power fiber lasers and amplifiers by allowing single-mode operation with an effective area (Aeff) much larger than in standard single-mode fibers. However, the size of LMA fibers is limited due to the presence of higher-order-modes (HOMs) which can degrade the output beam quality. In these systems, it is essential to characterize the spatial properties of the output beam accurately, for instance to determine the beam pointing stability. Different techniques have been proposed to evaluate the modal content of a beam exiting a LMA fiber and its amount of HOMs [1–3]. Some of them are based on intensity measurements and either need time consuming phase retrieval algorithm [1], or can only lead to the relative powers contained in the modes, without any information on the relative phase [2]. Another is based on a careful scanning of the intensity profile of a LMA fiber with a single-mode fiber [3], which is time consuming as well. As an alternative, we propose a simple method based on the simultaneous measurement of both intensity and phase profiles of the beam, performed by a high resolution (300×400 measurement points) shearing interferometer-based wavefront analyzer (SID4-HR, Phasics). We demonstrate a complete (amplitude and phase) and accurate analysis of the modal content, even for highly multimode beams. Since the measurement can be performed at video rates, this method opens the path for active wavefront correction techniques in multimode guiding structure (multimode or multicore fibers).
Starting Page	1
Ending Page	1
File Size	2123460
Page Count	1
File Format	PDF
ISBN	9781424440795
DOI	10.1109/CLEOE-EQEC.2009.5192746
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-14
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Performance evaluation Operational amplifiers Degradation High power amplifiers Phase measurement Stability Laser beams High power fiber lasers Spatial resolution Shearing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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