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Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers

Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers
Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers
Photodarkening-induced output power degradations and long-term stability in high power pulsed and CW fiber laser MOPA systems are discussed. The studied laser systems are based on aluminosilicate single-mode Yb-doped fibers and use the GTWave fiber technology for cladding pumping. The active fiber lengths are between 10-30m. We have tested Yb-doped fiber amplifiers operated under both pulsed and CW mode. Using OTDR background-loss measurements we show, for the first time, that the photodarkening-induced loss is non-uniformly distributed along the length of the active fiber. By calculating the average inversion along the fiber length, we show that the induced loss follows closely an Yb-inversion dependence to the power of 2. In addition we have studied the temperature dependence of the output power variation. It is shown that increasing (decreasing) operating temperature results in decrease (increase) of the laser output power, reaching the new equilibria over time scales of ~200 hours. We also present data on the non-photodarkening SPI fiber which is used in all SPI products.
9780819484512
79140L-79140L
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Ghiringhelli, Fabio
773894f2-f092-452f-84ae-98e3b64aca3f
Durkin, Michael K.
c9917856-22d8-40b0-ad28-21c484ca30ed
Crowe, Ian
0aeb3289-4406-468f-a58d-c125aabe8a68
Dawson, Jay W.
81e6237a-b130-4871-90d4-3217c7047d22
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Ghiringhelli, Fabio
773894f2-f092-452f-84ae-98e3b64aca3f
Durkin, Michael K.
c9917856-22d8-40b0-ad28-21c484ca30ed
Crowe, Ian
0aeb3289-4406-468f-a58d-c125aabe8a68
Dawson, Jay W.
81e6237a-b130-4871-90d4-3217c7047d22

Zervas, Michalis N., Ghiringhelli, Fabio, Durkin, Michael K. and Crowe, Ian (2011) Distribution of photodarkening-induced loss in Yb-doped fiber amplifiers. Dawson, Jay W. (ed.) SPIE 7914: Fiber Lasers VIII: Technology, Systems, and Applications, San Francisco, United States. 24 - 27 Jan 2011. 79140L-79140L . (doi:10.1117/12.877868).

Record type: Conference or Workshop Item (Other)

Abstract

Photodarkening-induced output power degradations and long-term stability in high power pulsed and CW fiber laser MOPA systems are discussed. The studied laser systems are based on aluminosilicate single-mode Yb-doped fibers and use the GTWave fiber technology for cladding pumping. The active fiber lengths are between 10-30m. We have tested Yb-doped fiber amplifiers operated under both pulsed and CW mode. Using OTDR background-loss measurements we show, for the first time, that the photodarkening-induced loss is non-uniformly distributed along the length of the active fiber. By calculating the average inversion along the fiber length, we show that the induced loss follows closely an Yb-inversion dependence to the power of 2. In addition we have studied the temperature dependence of the output power variation. It is shown that increasing (decreasing) operating temperature results in decrease (increase) of the laser output power, reaching the new equilibria over time scales of ~200 hours. We also present data on the non-photodarkening SPI fiber which is used in all SPI products.

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More information

e-pub ahead of print date: February 2011
Venue - Dates: SPIE 7914: Fiber Lasers VIII: Technology, Systems, and Applications, San Francisco, United States, 2011-01-24 - 2011-01-27
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 191563
URI: http://eprints.soton.ac.uk/id/eprint/191563
ISBN: 9780819484512
PURE UUID: 63b70cfc-e0c7-41a8-b101-73132332460e
ORCID for Michalis N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 22 Jun 2011 08:51
Last modified: 08 Jan 2022 02:36

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Contributors

Author: Fabio Ghiringhelli
Author: Michael K. Durkin
Author: Ian Crowe
Editor: Jay W. Dawson

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