NDLI: Symmetry-Free Tm-Doped Photonic Crystal Fiber With Enhanced Mode Area

Content Provider	IEEE Xplore Digital Library
Author	Coscelli, E. Molardi, C. Cucinotta, A. Selleri, S.
Copyright Year	1995
Abstract	Thulium-doped fiber lasers have recently attracted a growing interest because of the possibility to combine emission around 2 μm with the high beam quality and compactness provided by the fiber medium. A key factor for power scaling of these devices, especially if operation in the short- and ultrashort-pulse regime is desired, is the availability of active fibers capable of joining large effective area and robust single-mode guiding. The strong thermo-optic effect originating from the large quantum defect of Tm ions hinders the possibility to easily find a design with such features, strongly improving the confinement of high-order modes and shrinking the mode area of the fundamental one. In this paper, a rod-type double-cladding photonic crystal fiber with inner cladding properly designed without any mirror symmetry in the cross-section is presented, and its guiding properties are thoroughly analyzed by means of numerical simulations, taking into account the effects of thermally-induced refractive index change. The results have shown that, with a careful choice of the structural parameters, the proposed fiber is capable of ensuring effective high-order mode suppression and effective area up to 3800 μm ² when operating under heat load of about 300 W/m.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	544
Ending Page	550
Page Count	7
File Size	1192673
File Format	PDF
ISSN	1077260X
Volume Number	20
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating Frequency modulation Refractive index Load modeling Laser beams Couplings Pump lasers thulium-doped fibers Double-cladding photonic crystal fibers single-mode regime
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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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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