Efficient thulium-doped 2-μm germanate fiber laser

Jianfeng Wu, Shibin Jiang, Tao Luo, Jihong Geng, N. Peyghambarian, Norman P. Barnes

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


We report an efficient fiber laser operating near 2 μm. The glass for the fiber is germanate that is highly doped with thulium. The effect of cross relaxation energy transfer between thulium ions as observed from emission spectrum of the glass samples results in the laser having a very high slope efficiency of 58% with respect to launched power. This corresponds to a quantum efficiency of 1.79, indicating that each pump photon leads to near 1.8 excited Tm3+ ions.

Original languageEnglish (US)
Pages (from-to)334-336
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number2
StatePublished - Jan 15 2006


  • Germanate glass
  • Optical fiber lasers
  • Slope efficiency
  • Thulium

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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