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23 November 2015 Direct absorption measurements in thin rods and optical fibers
Christian Mühlig, Simon Bublitz, Martin Lorenz
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Proceedings Volume 9632, Laser-Induced Damage in Optical Materials: 2015; 96321Q (2015) https://doi.org/10.1117/12.2192579
Event: SPIE Laser Damage, 2015, Boulder, Colorado, United States
Abstract
We report on the first realization of direct absorption measurements in thin rods and optical fibers using the laser induced deflection (LID) technique. Typically, along the fiber processing chain more or less technology steps are able to introduce additional losses to the starting material. After the final processing, the fibers are commonly characterized regarding losses using the so-called cut-back technique in combination with spectrometers. This, however, only serves for a total loss determination. For optimization of the fiber processing, it would be of great interest to not only distinguish between different loss mechanisms but also have a better understanding of possible causes.

For measuring the absorption losses along the fiber processing, a particular concept for the LID technique is introduced and requirements, calibration procedure as well as first results are presented. It allows to measure thin rods, e.g. during preform manufacturing, as well as optical fibers. In addition, the results show the prospects to also apply the new concept to topics like characterizing unwanted absorption after fiber splicing or Bragg grating inscription.
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Christian Mühlig, Simon Bublitz, and Martin Lorenz "Direct absorption measurements in thin rods and optical fibers", Proc. SPIE 9632, Laser-Induced Damage in Optical Materials: 2015, 96321Q (23 November 2015); https://doi.org/10.1117/12.2192579
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KEYWORDS
Glasses
Absorption
Laser induced damage
Optical fibers
Calibration
Signal detection
Fiber Bragg gratings
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