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Amplification of a radially polarized beam in a thermally guiding ytterbium-doped fiber rod

Amplification of a radially polarized beam in a thermally guiding ytterbium-doped fiber rod
Amplification of a radially polarized beam in a thermally guiding ytterbium-doped fiber rod
Amplification of a radially polarized beam from an Yb:YAG seed laser at 1030 nm in a very-large-core triple-clad ytterbium-doped fiber configured as a thermally guiding fiber rod amplifier is demonstrated. The amplifier yielded a maximum output power of 10.7 W (limited by available pump power) with corresponding single-pass gain of 6.4 dB, while the radial polarization purity was maintained over the full range of pump power with a measured polarization extinction ratio of 100:1. The amplified output beam displayed the characteristic donut-shaped intensity profile with negligible beam distortion as evidenced by a measured beam propagation factor (M2) of 2.1 ± 0.1. A simplified model for propagation of a radially polarized beam in a thermally guided fiber rod is developed to provide insight into the underlying design principles and to establish a strategy for scaling output power. The power scaling limitations of this approach are considered.
lasers, optics, amplifier, fiber amplification, Fibre amplifiers, fibre, thermal effects, refractive index, radially polarized, donut mode
0946-2171
125-132
Jefferson-Brain, Thomas, Lewis
8bce2a02-37a4-4277-a8cb-0c40bde57837
Smith, Callum R
00a3e4af-743b-4c7f-b1df-bb142e176d63
Burns, Mark
7f7ca346-f31a-46cf-a848-acb4bcae18b9
Shardlow, Peter
9ca17301-8ae7-4307-8bb9-371df461520c
Clarkson, William
3b060f63-a303-4fa5-ad50-95f166df1ba2
Jefferson-Brain, Thomas, Lewis
8bce2a02-37a4-4277-a8cb-0c40bde57837
Smith, Callum R
00a3e4af-743b-4c7f-b1df-bb142e176d63
Burns, Mark
7f7ca346-f31a-46cf-a848-acb4bcae18b9
Shardlow, Peter
9ca17301-8ae7-4307-8bb9-371df461520c
Clarkson, William
3b060f63-a303-4fa5-ad50-95f166df1ba2

Jefferson-Brain, Thomas, Lewis, Smith, Callum R, Burns, Mark, Shardlow, Peter and Clarkson, William (2019) Amplification of a radially polarized beam in a thermally guiding ytterbium-doped fiber rod. Applied Physics B, 125 (9), 125-132. (doi:10.1007/s00340-019-7276-y).

Record type: Article

Abstract

Amplification of a radially polarized beam from an Yb:YAG seed laser at 1030 nm in a very-large-core triple-clad ytterbium-doped fiber configured as a thermally guiding fiber rod amplifier is demonstrated. The amplifier yielded a maximum output power of 10.7 W (limited by available pump power) with corresponding single-pass gain of 6.4 dB, while the radial polarization purity was maintained over the full range of pump power with a measured polarization extinction ratio of 100:1. The amplified output beam displayed the characteristic donut-shaped intensity profile with negligible beam distortion as evidenced by a measured beam propagation factor (M2) of 2.1 ± 0.1. A simplified model for propagation of a radially polarized beam in a thermally guided fiber rod is developed to provide insight into the underlying design principles and to establish a strategy for scaling output power. The power scaling limitations of this approach are considered.

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Accepted/In Press date: 2 August 2019
e-pub ahead of print date: 14 August 2019
Published date: September 2019
Keywords: lasers, optics, amplifier, fiber amplification, Fibre amplifiers, fibre, thermal effects, refractive index, radially polarized, donut mode

Identifiers

Local EPrints ID: 433479
URI: https://eprints.soton.ac.uk/id/eprint/433479
ISSN: 0946-2171
PURE UUID: 8ff514d4-1ec7-41ed-9233-a670cd60b627
ORCID for Thomas, Lewis Jefferson-Brain: ORCID iD orcid.org/0000-0002-8838-5640
ORCID for Mark Burns: ORCID iD orcid.org/0000-0003-2039-6025
ORCID for Peter Shardlow: ORCID iD orcid.org/0000-0003-0459-0581

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Date deposited: 23 Aug 2019 16:30
Last modified: 26 Nov 2019 01:38

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