7 March 2014 Spatially resolved in-core temperature measurement in rare-earth doped fibers during pumping
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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
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.
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Julia Fiebrandt, Julia Fiebrandt, Martin Leich, Martin Leich, Sonja Unger, Sonja Unger, Anka Schwuchow, Anka Schwuchow, Matthias Jäger, Matthias Jäger, Manfred Rothhardt, Manfred Rothhardt, Hartmut Bartelt, 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); doi: 10.1117/12.2037663; https://doi.org/10.1117/12.2037663

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