NDLI: Pump absorption in airclad step index and photonic crystal fibres for high power applications

Content Provider	IEEE Xplore Digital Library
Author	Olausson, C.B. Hansen, K.P. Bjarklev, A.
Copyright Year	2009
Description	Author affiliation: Department of Photonics Engineering, Technical University of Denmark, Ørsted Plads, DK-2800 Kgs. Lyngby, Denmark (Bjarklev, A.) \|\| Crystal Fibre A/S, Blokken 84, DK-3460 Birkerød, Denmark (Olausson, C.B.; Hansen, K.P.)
Abstract	Cladding-pumped fibers with high numerical aperture (NA) are commonly used in high-power lasers and amplifiers, which require the capture of pump light from low-brightness laser diodes. However, rays launched off-center into cladding-pumped fibers are less efficiently absorbed [1]. These skew rays follow a helical off-center path, have no overlap with the doped core and are not absorbed. Experiments show that skew rays can be suppressed by breaking the cylindrical symmetry of the inner cladding e.g. by using the technique of periodic bending of the fiber. Furthermore, it has been suggested that the pump absorption efficiency can be increased by including a small circular scatterer, which changes the ray pattern and induces chaotic dynamics in the fiber [2]. Suppression of skew rays is an important issue in the optimization of high power fiber lasers and amplifiers. Photonic crystal fibers inherently contain several small circular scatterers due to the hole structure in the pump cladding and are therefore expected to be less sensitive to skew rays than a traditional step index fiber. The aim of the experiment is to investigate the skew ray scrambling effect of the hole structure in photonic crystal fibers compared to the commonly used periodic bending method for step index fibers.
Starting Page	1
Ending Page	1
File Size	805927
Page Count	1
File Format	PDF
ISBN	9781424440795
DOI	10.1109/CLEOE-EQEC.2009.5194721
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	Coils High power amplifiers Absorption Photonic crystal fibers Light scattering Photonic crystals Particle scattering Apertures Periodic structures Power engineering and energy
Content Type	Text
Resource Type	Article

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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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