Symmetry-free tm-doped photonic crystal fiber with enhanced mode area

Enrico Coscelli, Carlo Molardi, Annamaria Cucinotta, Stefano Selleri

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Thulium-doped fiber lasers have recently attracted a growing interest because of the possibility to combine emission around 2 $\mu$m 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 2 when operating under heat load of about 300 W/m.

Original languageEnglish
Article number6709780
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume20
Issue number5
DOIs
Publication statusPublished - Sep 1 2014
Externally publishedYes

Fingerprint

Photonic crystal fibers
Laser modes
photonics
fibers
Fibers
symmetry
Thulium
crystals
Beam quality
Thermal load
Fiber lasers
Ultrashort pulses
Joining
thulium
Optics
Refractive index
Mirrors
void ratio
Availability
fiber lasers

Keywords

  • Double-cladding photonic crystal fibers
  • single-mode regime
  • thulium-doped fibers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Symmetry-free tm-doped photonic crystal fiber with enhanced mode area. / Coscelli, Enrico; Molardi, Carlo; Cucinotta, Annamaria; Selleri, Stefano.

In: IEEE Journal on Selected Topics in Quantum Electronics, Vol. 20, No. 5, 6709780, 01.09.2014.

Research output: Contribution to journalArticle

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