High-power continuous-wave 3- and 2-μm cascade Ho 3+: ZBLAN fiber laser and its medical applications

Tetsumi Sumiyoshi, Hitoshi Sekita, Tsunenori Arai, Shunichi Sato, Miya Ishihara, Makoto Kikuchi

Research output: Contribution to journalArticlepeer-review

106 Citations (Scopus)


A new medical fiber laser oscillating at two useful wavelengths (3 and 2 μm) is reported. We have demonstrated highly efficient and high-power continuous-wave cascade oscillation at room temperature with a holmium ion-doped fluoride glass fiber laser pumped with a 1.15-μm fiber Raman laser. The simultaneous oscillation wavelengths were 3 and 2 μm, and their combined output power was 3.0 W with a slope efficiency of 65%. To our best knowledge, this is the first achievement of watt-level-output power in the mid-infrared region with ZrF 4-BaF 2-LaF 3-AlF 3-NaF (ZBLAN) glass fiber. In experiments to evaluate potential for medical applications, we tested the two-wavelength beam as a laser surgical knife on soft rabbit tissues and demonstrated that it had strong cutting capability, and that the coagulation layer thickness could be controlled by varying the power ratio of the two-wavelength laser.

Original languageEnglish
Pages (from-to)936-943
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number4
Publication statusPublished - 1999 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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