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Photodarkening-induced phase distortions and their effects In single-channel and coherently combined Yb-doped fiber chirped pulse amplification systems

Photodarkening-induced phase distortions and their effects In single-channel and coherently combined Yb-doped fiber chirped pulse amplification systems
Photodarkening-induced phase distortions and their effects In single-channel and coherently combined Yb-doped fiber chirped pulse amplification systems
We use numerical simulations to investigate the effects of photodarkening (PD) on pulse compression and coherent combination following chirped-pulse amplification in Yb-doped fiber amplifiers. Even though we increase the pump power to keep the pulse energy constant, PD degrades the pulses due to phase distortions resulting from heating acting already within a pulse as well as to increased self-phase modulation if the fiber length is optimized for the PD-free fiber at beginning of life. By contrast, in a fiber shorter than this, the drop in peak power is a relatively modest 35% even at a PD propagation loss as large as 5 dB, thus providing effective mitigation against PD-induced phase distortions. The improvements extend to the combination efficiency of beam-combined systems.
Fiber lasers , Ultrafast optics , Phase distortion
0733-8724
5521-5527
Feng, Yujun
25a28374-33d9-478f-9bd2-98f0d93231af
Zhang, Betty Meng
93b8aca7-c6ae-45b9-9bcd-c201fdf2d116
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Feng, Yujun
25a28374-33d9-478f-9bd2-98f0d93231af
Zhang, Betty Meng
93b8aca7-c6ae-45b9-9bcd-c201fdf2d116
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Feng, Yujun, Zhang, Betty Meng and Nilsson, Johan (2018) Photodarkening-induced phase distortions and their effects In single-channel and coherently combined Yb-doped fiber chirped pulse amplification systems. Journal of Lightwave Technology, 36 (23), 5521-5527. (doi:10.1109/JLT.2018.2874086).

Record type: Article

Abstract

We use numerical simulations to investigate the effects of photodarkening (PD) on pulse compression and coherent combination following chirped-pulse amplification in Yb-doped fiber amplifiers. Even though we increase the pump power to keep the pulse energy constant, PD degrades the pulses due to phase distortions resulting from heating acting already within a pulse as well as to increased self-phase modulation if the fiber length is optimized for the PD-free fiber at beginning of life. By contrast, in a fiber shorter than this, the drop in peak power is a relatively modest 35% even at a PD propagation loss as large as 5 dB, thus providing effective mitigation against PD-induced phase distortions. The improvements extend to the combination efficiency of beam-combined systems.

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IEEE Photo Darkening Heating Induced Phase Distortion - Author's Original
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Photodarkening-Induced Phase Distortions And Their Effects In Single-Channel And Coherently Combined Yb-Doped Fiber Chirped Pulse Amplification Syste - Accepted Manuscript
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More information

Submitted date: 29 March 2018
Accepted/In Press date: 25 September 2018
e-pub ahead of print date: 4 October 2018
Published date: December 2018
Keywords: Fiber lasers , Ultrafast optics , Phase distortion

Identifiers

Local EPrints ID: 425058
URI: http://eprints.soton.ac.uk/id/eprint/425058
ISSN: 0733-8724
PURE UUID: 8d321421-d9ea-4d6c-9a96-ad69f15275cf
ORCID for Yujun Feng: ORCID iD orcid.org/0000-0001-7839-065X
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 09 Oct 2018 16:30
Last modified: 07 Oct 2020 01:42

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