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Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability

Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability
Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability

We introduced a simple formula providing the mode-field diameter shrinkage, due to heat load in fiber amplifiers, and used it to compare the traditional thermal-lensing power limit (PTL) to a newly developed transverse-mode instability (TMI) power limit (PTMI), giving a fixed ratio of PTMI/PTL≈0.6, in very good agreement with experiment. Using a failure-in-time analysis we also introduced a new power limiting factor due to mechanical reliability of bent fibers. For diode (tandem) pumping power limits of 28kW (52kW) are predicted. Setting a practical limit of maximum core diameter to ∼35μm, the limits reduce to 15kW (25kW).

high power fiber amplifiers, high power fiber lasers, mechanical reliability, power scalability, thermal lensing, transverse mode instability
SPIE
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701

Zervas, Michalis N. (2018) Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability. In Fiber Lasers XV: Technology and Systems. vol. 10512, SPIE.. (doi:10.1117/12.2289792).

Record type: Conference or Workshop Item (Paper)

Abstract

We introduced a simple formula providing the mode-field diameter shrinkage, due to heat load in fiber amplifiers, and used it to compare the traditional thermal-lensing power limit (PTL) to a newly developed transverse-mode instability (TMI) power limit (PTMI), giving a fixed ratio of PTMI/PTL≈0.6, in very good agreement with experiment. Using a failure-in-time analysis we also introduced a new power limiting factor due to mechanical reliability of bent fibers. For diode (tandem) pumping power limits of 28kW (52kW) are predicted. Setting a practical limit of maximum core diameter to ∼35μm, the limits reduce to 15kW (25kW).

Text
Power scaling limits in high power fiber amplifiers due to transverse mode instability, thermal lensing, and fiber mechanical reliability - Accepted Manuscript
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More information

Accepted/In Press date: 20 November 2017
e-pub ahead of print date: 26 February 2018
Additional Information: Acceptance date date and AM added.
Venue - Dates: Fiber Lasers XV: Technology and Systems 2018, , San Francisco, United States, 2018-01-29 - 2018-02-01
Keywords: high power fiber amplifiers, high power fiber lasers, mechanical reliability, power scalability, thermal lensing, transverse mode instability

Identifiers

Local EPrints ID: 420786
URI: http://eprints.soton.ac.uk/id/eprint/420786
PURE UUID: de5606b4-157c-4ffd-89e8-481479e63bb4
ORCID for Michalis N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 16 May 2018 16:30
Last modified: 28 Apr 2022 01:35

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