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High power 1726nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser

High power 1726nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser
High power 1726nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser
There are a number of spectral features around 1700 nm which are very attractive to the laser community. Strong C-H bond absorption and moderate water absorption lend this region to many applications such as polymer processing and laser surgery. Despite being a growing area of interest, development of high-power, laser sources in this region is quite challenging. Here we present preliminary results of in-band pumping a thulium-doped fiber laser (TDFL) with erbium-only doped fiber laser (EDFL) to generate 1700 nm.

Erbium-only was chosen to avoid the power scaling limitations of co-doping with ytterbium. Parasitic lasing on the ytterbium band at 1030 nm results in efficiency roll-off and self-pulsing. Because of this, single-mode Er/Yb laser systems are generally limited to moderate powers of ~20W and reliability remains an issue.

An in-house double-clad large mode-area fiber, with a fundamental mode-field diameter of 20 um, was cladding pumped at 975 nm. Maximum power at 90 W launched was 31 W and the slope efficiency was 44.2% (35.4%) with respect to absorbed (launched) pump power. Suitability for high-brightness core pumping of a TDFL was confirmed with an M2 measurement of 1.1±0.1.

For 1700nm generation, the 1580nm pump light was free-space coupled into an in-house TDF (0.2 wt.% dopant concentration). For a maximum launched power of 23W, 15W of 1726nm output was generated with a slope efficiency of 67.1% (64.7%) with respect to absorbed (launched). To the author’s best knowledge, this is the highest recorded power in this wavelength region from a TDFL at the time of writing.
Fibre, Fibre Laser, Erbium, Thulium, erbium-doped fiber laser, Thulium fiber, continuous wave lasers, rare earth (re) metals
Burns, Mark
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Shardlow, Peter
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Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Jefferson-Brain, Thomas, Lewis
8bce2a02-37a4-4277-a8cb-0c40bde57837
Sahu, Jayanta
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Burns, Mark
7f7ca346-f31a-46cf-a848-acb4bcae18b9
Shardlow, Peter
9ca17301-8ae7-4307-8bb9-371df461520c
Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Jefferson-Brain, Thomas, Lewis
8bce2a02-37a4-4277-a8cb-0c40bde57837
Sahu, Jayanta
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2

Burns, Mark, Shardlow, Peter, Barua, Pranabesh, Jefferson-Brain, Thomas, Lewis, Sahu, Jayanta and Clarkson, W.A. (2019) High power 1726nm operation of a thulium fiber laser pumped in-band by an erbium-only fiber laser. Fiber Lasers XVI: Technology and Systems, San Francisco, United States. 04 - 07 Feb 2019. 1 pp .

Record type: Conference or Workshop Item (Other)

Abstract

There are a number of spectral features around 1700 nm which are very attractive to the laser community. Strong C-H bond absorption and moderate water absorption lend this region to many applications such as polymer processing and laser surgery. Despite being a growing area of interest, development of high-power, laser sources in this region is quite challenging. Here we present preliminary results of in-band pumping a thulium-doped fiber laser (TDFL) with erbium-only doped fiber laser (EDFL) to generate 1700 nm.

Erbium-only was chosen to avoid the power scaling limitations of co-doping with ytterbium. Parasitic lasing on the ytterbium band at 1030 nm results in efficiency roll-off and self-pulsing. Because of this, single-mode Er/Yb laser systems are generally limited to moderate powers of ~20W and reliability remains an issue.

An in-house double-clad large mode-area fiber, with a fundamental mode-field diameter of 20 um, was cladding pumped at 975 nm. Maximum power at 90 W launched was 31 W and the slope efficiency was 44.2% (35.4%) with respect to absorbed (launched) pump power. Suitability for high-brightness core pumping of a TDFL was confirmed with an M2 measurement of 1.1±0.1.

For 1700nm generation, the 1580nm pump light was free-space coupled into an in-house TDF (0.2 wt.% dopant concentration). For a maximum launched power of 23W, 15W of 1726nm output was generated with a slope efficiency of 67.1% (64.7%) with respect to absorbed (launched). To the author’s best knowledge, this is the highest recorded power in this wavelength region from a TDFL at the time of writing.

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More information

Published date: 4 February 2019
Venue - Dates: Fiber Lasers XVI: Technology and Systems, San Francisco, United States, 2019-02-04 - 2019-02-07
Keywords: Fibre, Fibre Laser, Erbium, Thulium, erbium-doped fiber laser, Thulium fiber, continuous wave lasers, rare earth (re) metals

Identifiers

Local EPrints ID: 428937
URI: https://eprints.soton.ac.uk/id/eprint/428937
PURE UUID: 72d4d352-5c46-4093-80d7-f50198a57db9
ORCID for Mark Burns: ORCID iD orcid.org/0000-0003-2039-6025
ORCID for Peter Shardlow: ORCID iD orcid.org/0000-0003-0459-0581
ORCID for Thomas, Lewis Jefferson-Brain: ORCID iD orcid.org/0000-0002-8838-5640

Catalogue record

Date deposited: 15 Mar 2019 17:30
Last modified: 22 Mar 2019 01:31

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