Efficient 2.96 micron dysprosium-doped ZBLAN fibre laser pumped at 1.3 micron

Yuen Hong Tsang, Atalla E. El-Taher, Terence A. King, Kuang Po Chang, Stuart D. Jackson

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

8 Citations (Scopus)

Abstract

Wavelengths around 1.15 μm, 1.3 μm and 1.7 μm can be used to pump Dy-doped ZBLAN fibre in order to generate ∼3 μm with high efficiency. Previously the generation of 2.9 μm from the Dy-ZBLAN fibre was demonstrated by pumping with 1.1 μm Yb-silica fibre laser sources. The laser slope efficiency and lasing threshold demonstrated was about ∼5% and ∼1.78 W. In this investigation, the longer wavelength absorption band (6H9/2,6F11/2) centred at 1.3 μm of Dy3+-doped ZBLAN is utilised and the lasing transition around ∼3 μm takes places from6H13/2→6H15/2. With this pumping scheme the Stokes' efficiency is expected to be up to ∼45%. A quasi-continuous wave Dy3+-ZBLAN fibre laser pumped by a ∼1.3 μm Nd:YAG laser and operating at 2.96 μm with a bandwidth (FWHM) of ∼14 nm has been demonstrated. For a 60cm fibre length, a threshold of 0.5W and a slope efficiency of ∼20% with respect to the absorbed pump power was observed. The overall pump absorption in the fibre was around 84%. The cavity reflectivities at 2.9 μm were 99% and 50%. The demonstrated slope efficiency was 45% of the Stokes' limit. The slope efficiency was around four times higher and the threshold around 3.6 times lower than the previous performance demonstrated by using the 1.1 μm Yb fibre laser pumping scheme. The higher performance achieved compared to the 1.1 μm pump scheme is due to the higher Stokes' limit, lower pump ESA losses and higher cavity reflectivity. About 590 cm-1Raman Stokes shift has also detected by using 514.5 nm and 488 nm Ar ion laser as excitation pump sources.
Original languageEnglish
Title of host publicationSolid State Lasers and Amplifiers II
Volume6190
DOIs
Publication statusPublished - 16 Oct 2006
Externally publishedYes
EventSolid State Lasers and Amplifiers II - Strasbourg, France
Duration: 5 Apr 20066 Apr 2006

Conference

ConferenceSolid State Lasers and Amplifiers II
Country/TerritoryFrance
CityStrasbourg
Period5/04/066/04/06

Keywords

  • Dy
  • Dysprosium
  • Fiber / fibre laser
  • Fluoride
  • Infrared
  • Raman scattering
  • ZBLAN

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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