Spatially resolved in-core temperature measurement in rare-earth doped fibers during pumping

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

doi:10.1117/12.2037663

7 March 2014 Spatially resolved in-core temperature measurement in rare-earth doped fibers during pumping

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

Author Affiliations +

Proceedings Volume 8982, Optical Components and Materials XI; 898206 (2014) https://doi.org/10.1117/12.2037663
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We demonstrate a spatially distributed measurement technique to observe temperature changes along a pumped Ybdoped fiber. The technique is based on an array of fiber Bragg gratings acting as temperature sensor line. The Bragg gratings are inscribed directly into the actively doped fiber core using high intensity laser pulses and an interferometric setup. We studied the temperature evolution in differently doped fibers under pumping conditions and find different effects contributing to the observed temperature increase. To avoid an additional heating caused by pump-induced photodarkening, we measure the spatially resolved temperature profile during pumping along a photodarkening-reduced, cerium co-doped fiber.

Citation Download Citation

Julia Fiebrandt, Martin Leich, Sonja Unger, Anka Schwuchow, Matthias Jäger, Manfred Rothhardt, and Hartmut Bartelt "Spatially resolved in-core temperature measurement in rare-earth doped fibers during pumping", Proc. SPIE 8982, Optical Components and Materials XI, 898206 (7 March 2014); https://doi.org/10.1117/12.2037663

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