Radiation-balanced silica fiber laser

J. Knall, M. Engholm, T. Boilard, M. Bernier, P. B. Vigneron, N. Yu, P. D. Dragic, J. Ballato, M. J.F. Digonnet

Research output: Contribution to journalArticlepeer-review


In optically pumped lasers, heat generated by the quantum defect causes detrimental fluctuations in the output mode, frequency, and power. Common heat-mitigation techniques use bulky mechanical coolers that introduce vibrations, leading to laser frequency and amplitude noise. Here, we present a radiation-balanced fiber laser, optically cooled by anti-Stokes fluorescence (ASF). The gain medium is a silica fiber with a 21-µm-diameter core doped with 2.06 wt. % Yb3+ and co-doped with Al2O3 and F- to reduce concentration quenching. The laser was core-pumped at 1040 nm to create both gain at 1065 nm and ASF cooling at atmospheric pressure. We demonstrate a maximum output power of 114 mW with a slope efficiency of 41% while maintaining near-zero average temperature change. This result could enable the development of fiber lasers with unprecedented coherence and stability.

Original languageEnglish (US)
Pages (from-to)830-833
Number of pages4
Issue number6
StatePublished - Jun 2021
Externally publishedYes

ASJC Scopus subject areas

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


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