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Experimental measurements of the origin of self-phasing in passively coupled fiber lasers

Experimental measurements of the origin of self-phasing in passively coupled fiber lasers
Experimental measurements of the origin of self-phasing in passively coupled fiber lasers
We have directly measured the intensity distribution, gain, and induced phase shift between two fiber lasers that are coherently combined by a Dammann grating. The induced phase shift between the lasers has been shown to approximately cancel out any applied phase error introduced into the cavity, allowing the combined resonator to operate at an efficient low-loss state. We show that the origin of this self-phasing stems from a redistribution of power between the two lasers. The resulting difference in circulating intensity produces a differential change in saturated gain, which in turn produces a differential Kramers-Kronig phase shift that effectively cancels the applied phase error.
0146-9592
962-965
Chiang, Hung-Sheng
27fef11c-4224-4973-9367-b64bf314b21c
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Sahu, Jayanta
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Leger, James R.
7afbc5c6-2518-49bf-8b03-1a2456ebe2d8
Chiang, Hung-Sheng
27fef11c-4224-4973-9367-b64bf314b21c
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Sahu, Jayanta
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Leger, James R.
7afbc5c6-2518-49bf-8b03-1a2456ebe2d8

Chiang, Hung-Sheng, Nilsson, Johan, Sahu, Jayanta and Leger, James R. (2015) Experimental measurements of the origin of self-phasing in passively coupled fiber lasers. Optics Letters, 40 (6), 962-965. (doi:10.1364/OL.40.000962).

Record type: Article

Abstract

We have directly measured the intensity distribution, gain, and induced phase shift between two fiber lasers that are coherently combined by a Dammann grating. The induced phase shift between the lasers has been shown to approximately cancel out any applied phase error introduced into the cavity, allowing the combined resonator to operate at an efficient low-loss state. We show that the origin of this self-phasing stems from a redistribution of power between the two lasers. The resulting difference in circulating intensity produces a differential change in saturated gain, which in turn produces a differential Kramers-Kronig phase shift that effectively cancels the applied phase error.

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More information

Accepted/In Press date: 6 February 2015
e-pub ahead of print date: 9 March 2015
Published date: 15 March 2015
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 386194
URI: https://eprints.soton.ac.uk/id/eprint/386194
ISSN: 0146-9592
PURE UUID: cdfe0988-8f93-4359-bc3c-4f01f5addc69
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 21 Jan 2016 09:48
Last modified: 15 Jul 2019 20:50

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