High power 2μm Tm 3+-doped fibre lasers

Gavin Frith*, David G. Lancaster, Stuart D. Jackson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Using Tm 3+-doped double-clad silica fibre we have produced high power, high efficiency 2μm lasers. To date we have achieved a 59% slope efficiency relative to launched pump power using single end pumping and double passing the pump light. By pumping the fibre laser from both ends, we achieved up to 118W peak output power with 54% slope efficiency relative to launched power at 25% duty cycle. The quantum efficiency of this laser was 120% relative to launched pump power, which we attribute to a cross-relaxation process in Tm 3+ ( 3H 4, 3H 63F 4, 3F 4). We have also demonstrated fixed wavelength operation of the laser near 1.9μm by using fibre Bragg gratings.

Original languageEnglish
Article number05
Pages (from-to)36-45
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2004
Externally publishedYes


  • Double-clad
  • Fibre laser
  • Thulium


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