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01351 am a22001573u 4500 |
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13897 |
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|a Shen, D.Y.
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|a Abdolvand, A.
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|a Cooper, L.J.
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|a Clarkson, W.A.
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|a Efficient Ho:YAG laser pumped by a cladding-pumped tunable Tm:silica-fibre laser
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|c 2004-07-07.
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|z Get fulltext
|u https://eprints.soton.ac.uk/13897/1/2989.pdf
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|a 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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