Half-Watt Tm3+-Doped Fluoride Fiber Laser at 785 nm

Masoud Mollaee, Xiushan Zhu, Jie Zong, Kort Wiersma, Arturo Chavez-Pirson, R. A. Norwood, N. Peyghambarian

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


All-fiber single-transverse-mode laser oscillators operating at 785 nm were demonstrated by splicing a 0.1 mol% Tm3+-doped fluoride fiber with a core diameter of 4 μm and a numerical aperture of 0.07 to a pair of silica fiber Bragg gratings. About 500 mW of continuous-wave single transverse mode laser output at 784.5 nm with a 3-dB spectral bandwidth of 0.2 nm was obtained by upconversion pumping a 3-m-long gain fiber at 1125 nm. Our experiments show that the ground-state absorption of Tm3+ at 785 nm is the origin of low efficiency in previous reports. The efficiency of this all-fiber laser can be improved by using a gain fiber with an optimized overlap between the laser, the pump, and the fiber core, and employing new pumping schemes that deplete the ground state sufficiently.

Original languageEnglish (US)
Article number8424152
Pages (from-to)1563-1566
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number17
StatePublished - Sep 1 2018


  • Fiber lasers
  • fiber optics
  • thulium
  • upconversion

ASJC Scopus subject areas

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


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