Broadband 1.20 μm emission in Tm3+-doped and Tm3+/Tb3+, Eu3+codoped gallogermanate glasses

Bo Zhou, Lili Tao, Yuen Hong Tsang, Edwin Yue Bun Pun

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


Broadband 1.20 μm emission originating from the Thulium (Tm3+):1G4→3H4transition was observed in Tm3+-doped gallogermanate glasses under 476.5 nm excitation. The stimulated emission cross-section is calculated to be 2.85 × 10-21cm2using the Füchtbauer-Ladenburg approach. Difficulty in the population inversion between the upper 1G4 and lower 3H4 levels resulting from the cross relaxation process Tm3+[1G4,3H6] → [3H4,3H5] was overcome by the incorporation of Terbium (Tb3+) and Europium (Eu3+) ions. A Judd-Ofelt analysis was performed based on the absorption spectrum and the derived intensity parameters (Ω2= 4.65 × 10-20, Ω4= 1.51 × 10-20, and Ω6= 1.42 × 10-20cm2) reveal a strong asymmetry and covalent environment between Tm3+ions and ligands in the host matrix. The results indicate that the Tm3+/ Tb3+, Eu3+codoping scheme is promising in the development of amplifiers and lasers operating at the relatively unexplored 1.2 μm wavelength region.
Original languageEnglish
Pages (from-to)1776-1780
Number of pages5
JournalOptical Materials
Issue number11
Publication statusPublished - 1 Jan 2012


  • Broadband 1.20 μm emission
  • Energy transfer
  • Optical amplification

ASJC Scopus subject areas

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


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