Length distributed measurement of temperature effects in Yb-doped fibers during pumping

Martin Leich; Julia Fiebrandt; Anka Schwuchow; Sylvia Jetschke; Sonja Unger; Matthias Jäger; Manfred Rothhardt; Hartmut Bartelt

doi:10.1117/1.OE.53.6.066101

3 June 2014 Length distributed measurement of temperature effects in Yb-doped fibers during pumping

Martin Leich, Julia Fiebrandt, Anka Schwuchow, Sylvia Jetschke, Sonja Unger, Matthias Jäger, Manfred Rothhardt, Hartmut Bartelt

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Optical Engineering, Vol. 53, Issue 6, 066101 (June 2014). https://doi.org/10.1117/1.OE.53.6.066101

Abstract

We demonstrate a distributed measurement technique to observe temperature changes along pumped Yb-doped fibers. This technique is based on an array of fiber Bragg gratings acting as a temperature sensor line. The Bragg gratings are inscribed directly into the Yb-doped fiber core using high-intensity ultrashort laser pulses and an interferometric setup. We studied the temperature evolution in differently co-doped Yb fibers during optical pumping and identified different effects contributing to the observed temperature increase. We found that preloading of fibers with hydrogen supports the formation of Yb ²+ during UV irradiation and has a large impact on fiber temperature during pumping. The proposed technique can be applied to investigate the homogeneity of pump absorption in active fibers and to support spatially resolved photodarkening measurements.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Martin Leich, Julia Fiebrandt, Anka Schwuchow, Sylvia Jetschke, Sonja Unger, Matthias Jäger, Manfred Rothhardt, and Hartmut Bartelt "Length distributed measurement of temperature effects in Yb-doped fibers during pumping," Optical Engineering 53(6), 066101 (3 June 2014). https://doi.org/10.1117/1.OE.53.6.066101

Published: 3 June 2014

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Cited by 8 scholarly publications.

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KEYWORDS

Optical fibers

Fiber Bragg gratings

Temperature metrology

Absorption

Ytterbium

Ultraviolet radiation

Cerium

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