Share Email Print
cover

Optical Engineering • Open Access

Length distributed measurement of temperature effects in Yb-doped fibers during pumping
Author(s): Martin Leich; Julia Fiebrandt; Anka Schwuchow; Sylvia Jetschke; Sonja Unger; Matthias Jäger; Manfred Rothhardt; Hartmut Bartelt

Paper 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.

Paper Details

Date Published: 3 June 2014
PDF: 5 pages
Opt. Eng. 53(6) 066101 doi: 10.1117/1.OE.53.6.066101
Published in: Optical Engineering Volume 53, Issue 6
Show Author Affiliations
Martin Leich, Institut für Photonische Technologien e.V. (Germany)
Julia Fiebrandt, Institut für Photonische Technologien e.V. (Germany)
Anka Schwuchow, Institut für Photonische Technologien e.V. (Germany)
Sylvia Jetschke, Institut für Photonische Technologien e.V. (Germany)
Sonja Unger, Institut für Photonische Technologien e.V. (Germany)
Matthias Jäger, Institut für Photonische Technologien e.V. (Germany)
Manfred Rothhardt, Institut für Photonische Technologien e.V. (Germany)
Hartmut Bartelt, Institut für Photonische Technologien e.V. (Germany)


© SPIE. Terms of Use
Back to Top