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Thulium-ytterbium co-doped fiber laser with 75W of output power at 2 microns

Thulium-ytterbium co-doped fiber laser with 75W of output power at 2 microns
Thulium-ytterbium co-doped fiber laser with 75W of output power at 2 microns
Recently, ytterbium-sensitization was developed for thulium-doped fibers for operation at ~2µm. In these, pump energy at 910-980nm is absorbed by the Yb Here, we present further power-scaling of a cladding-pumped Tm:Yb codoped fiber laser. A Tm:Yb codoped preform was fabricated at the OFTC in Sydney. From this, a double-clad fiber was drawn at the ORC in Southampton. The fiber had a 18.5µm diameter, 0.22 NA aluminosilicate core doped with Tm and Yb in equal concentrations (weight fraction 2%). The pure-silica inner cladding had a 300µm diameter, D-shaped geometry. The inner cladding was coated with a low-index polymer for pump waveguiding. The absorption at the pump wavelength (975nm) was 4 dB/m. A 2.5m long TYDF was used in the experiments. The laser cavity was formed between a perpendicularly cleaved fiber facet at the pump launch end and an external, lens-coupled dichroic mirror in the other end of the cavity. A diode-stack pump source was launched into the TYDF. The fiber laser output was taken from the pump launch end via a dichroic mirror, HR around 2µm. The slope efficiency was 26% and the threshold was 7 W with respect to launched pump power. The maximum output power (75W) was limited by failure of the core at the out-coupling facet. We did not measure the beam quality or the emission spectrum, but we did determine that the laser operated in the 2µm wavelength range. Emission at ~1µm was negligible.
Jeong, Y.
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Dupriez, P.
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Sahu, Jayanta
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Nilsson, J.
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Shen, D.Y.
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Clarkson, W.A.
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Jackson, S.D.
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Jeong, Y.
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Dupriez, P.
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Sahu, Jayanta
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Nilsson, J.
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Shen, D.Y.
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Clarkson, W.A.
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Jackson, S.D.
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Jeong, Y., Dupriez, P., Sahu, Jayanta, Nilsson, J., Shen, D.Y., Clarkson, W.A. and Jackson, S.D. (2004) Thulium-ytterbium co-doped fiber laser with 75W of output power at 2 microns. SPIE European Symposium on Optics and Photonics for Defence & Security. 25 - 28 Oct 2004. 1 pp . (doi:10.1117/12.578727).

Record type: Conference or Workshop Item (Paper)

Abstract

Recently, ytterbium-sensitization was developed for thulium-doped fibers for operation at ~2µm. In these, pump energy at 910-980nm is absorbed by the Yb Here, we present further power-scaling of a cladding-pumped Tm:Yb codoped fiber laser. A Tm:Yb codoped preform was fabricated at the OFTC in Sydney. From this, a double-clad fiber was drawn at the ORC in Southampton. The fiber had a 18.5µm diameter, 0.22 NA aluminosilicate core doped with Tm and Yb in equal concentrations (weight fraction 2%). The pure-silica inner cladding had a 300µm diameter, D-shaped geometry. The inner cladding was coated with a low-index polymer for pump waveguiding. The absorption at the pump wavelength (975nm) was 4 dB/m. A 2.5m long TYDF was used in the experiments. The laser cavity was formed between a perpendicularly cleaved fiber facet at the pump launch end and an external, lens-coupled dichroic mirror in the other end of the cavity. A diode-stack pump source was launched into the TYDF. The fiber laser output was taken from the pump launch end via a dichroic mirror, HR around 2µm. The slope efficiency was 26% and the threshold was 7 W with respect to launched pump power. The maximum output power (75W) was limited by failure of the core at the out-coupling facet. We did not measure the beam quality or the emission spectrum, but we did determine that the laser operated in the 2µm wavelength range. Emission at ~1µm was negligible.

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Published date: 2004
Additional Information: Paper 5620-4
Venue - Dates: SPIE European Symposium on Optics and Photonics for Defence & Security, 2004-10-25 - 2004-10-28

Identifiers

Local EPrints ID: 41680
URI: https://eprints.soton.ac.uk/id/eprint/41680
PURE UUID: 269bac20-c790-4765-a70d-0ff1a506d731
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

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Date deposited: 12 Oct 2006
Last modified: 26 Nov 2019 01:56

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Contributors

Author: Y. Jeong
Author: P. Dupriez
Author: Jayanta Sahu
Author: J. Nilsson ORCID iD
Author: D.Y. Shen
Author: W.A. Clarkson
Author: S.D. Jackson

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