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Cladding shaping of optical fibre preforms via CO2 laser machining

Cladding shaping of optical fibre preforms via CO2 laser machining
Cladding shaping of optical fibre preforms via CO2 laser machining
Double-clad silica fibres used in high power lasers typically comprise a core doped with a laser active ion, a silica inner-cladding pump guide and a low refractive index outer polymer coating for protection and low loss pump guidance. For efficient pump absorption in the active-ion doped core, the inner-cladding must be shaped in order to scramble the pump radiation to achieve a high spatial overlap with the core. This shaping is traditionally undertaken via diamond milling of the fibre preform into an octagon or hexagon, leaving a rough surface that is subsequently fire polished. We report on a new approach for shaping the inner-cladding using a CO2 laser to machine the fibre preform. This process is shown to allow fabrication of novel cladding structures, which include concave and convex surfaces, as well as a significant increase in the processing speeds and avoids the need for fire polishing prior to fibre drawing.
Shardlow, P.C.
9ca17301-8ae7-4307-8bb9-371df461520c
Standish, R.
ce563e93-d448-47d3-90d9-bf4dd62af9f6
Sahu, J.K.
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Clarkson, W.A.
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Shardlow, P.C.
9ca17301-8ae7-4307-8bb9-371df461520c
Standish, R.
ce563e93-d448-47d3-90d9-bf4dd62af9f6
Sahu, J.K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2

Shardlow, P.C., Standish, R., Sahu, J.K. and Clarkson, W.A. (2015) Cladding shaping of optical fibre preforms via CO2 laser machining. CLEO/Europe-EQEC '15, Munich, Germany. 21 - 25 Jun 2015. 1 pp .

Record type: Conference or Workshop Item (Poster)

Abstract

Double-clad silica fibres used in high power lasers typically comprise a core doped with a laser active ion, a silica inner-cladding pump guide and a low refractive index outer polymer coating for protection and low loss pump guidance. For efficient pump absorption in the active-ion doped core, the inner-cladding must be shaped in order to scramble the pump radiation to achieve a high spatial overlap with the core. This shaping is traditionally undertaken via diamond milling of the fibre preform into an octagon or hexagon, leaving a rough surface that is subsequently fire polished. We report on a new approach for shaping the inner-cladding using a CO2 laser to machine the fibre preform. This process is shown to allow fabrication of novel cladding structures, which include concave and convex surfaces, as well as a significant increase in the processing speeds and avoids the need for fire polishing prior to fibre drawing.

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Published date: June 2015
Venue - Dates: CLEO/Europe-EQEC '15, Munich, Germany, 2015-06-21 - 2015-06-25
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 379502
URI: https://eprints.soton.ac.uk/id/eprint/379502
PURE UUID: 4a36ceb8-8219-44cd-86f5-715892697b3a
ORCID for P.C. Shardlow: ORCID iD orcid.org/0000-0003-0459-0581

Catalogue record

Date deposited: 23 Jul 2015 13:53
Last modified: 31 Jan 2019 01:32

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Contributors

Author: P.C. Shardlow ORCID iD
Author: R. Standish
Author: J.K. Sahu
Author: W.A. Clarkson

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