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Efficient Ho : YAG laser pumped by a cladding-pumped tunable Tm : silica-fibre laser

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Abstract

Highly efficient room-temperature operation of a Ho:YAG laser end pumped by a cladding-pumped tunable Tm-doped silica-fibre laser operating at 1905 nm is reported. Using a simple two-mirror resonator configuration, we obtained 6.4 W of unpolarized output at 2097 nm in a diffraction-limited TEM00 beam (with M2≈1.1) for 9.6 W of incident pump power, corresponding to a slope efficiency with respect to incident pump power of 80% and an optical-to-optical efficiency of 67%. Using a folded-resonator configuration incorporating a Brewster-angled glass plate, we obtained 5.8 W of linearly polarized TEM00 output, corresponding to an optical-to-optical efficiency of ∼60%. Due to low quantum defect heating, the depolarization loss due to thermally induced birefringence in the Ho : YAG crystal was <0.14% at the maximum available pump power, indicating that there is scope for further power scaling.

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Authors and Affiliations

  1. Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK

    D.Y. Shen, A. Abdolvand, L.J. Cooper & W.A. Clarkson

Authors
  1. D.Y. Shen
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  2. A. Abdolvand
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  3. L.J. Cooper
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  4. W.A. Clarkson
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Corresponding author

Correspondence to D.Y. Shen.

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PACS

42.55.-f; 42.55.Xi; 42.55.Wd; 42.60.Pk

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Shen, D., Abdolvand, A., Cooper, L. et al. Efficient Ho : YAG laser pumped by a cladding-pumped tunable Tm : silica-fibre laser. Appl Phys B 79, 559–561 (2004). https://doi.org/10.1007/s00340-004-1562-y

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  • DOI: https://doi.org/10.1007/s00340-004-1562-y

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