27 April 2016 Active fiber polymer cladding temperature measurement under conditions of laser generation and amplification
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Polymer cladding temperature of active fiber in lasing regime is important parameter as it allows determination of fiber core temperature that in turn effects laser generation and amplification efficiency. Besides polymer cladding has much lower temperature damage threshold comparing to fused silica. For example, 200 degrees Kelvin overheating of the polymer cladding can result in fiber degradation. In present paper we introduce novel and simple method for precise temperature measurement of active fibers cladding under conditions of laser generation and amplification. Dependence of longitudinal temperature distribution along active fibers on optical pump power can be determined. This method employs measurement of temperature dependent electrical resistance of the metal wire being in thermal contact with fiber polymer cladding. The wire is reeled on the active fiber segment. Under lasing or amplification conditions the polymer cladding of the active fiber is heated together with coiled metal wire resulting in its electrical resistance change. By measuring resistance variation one can determine the temperature of the given fiber section.
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V. E. Sypin, V. E. Sypin, K. Yu. Prusakov, K. Yu. Prusakov, O. A. Ryabushkin, O. A. Ryabushkin, "Active fiber polymer cladding temperature measurement under conditions of laser generation and amplification", Proc. SPIE 9886, Micro-Structured and Specialty Optical Fibres IV, 98861J (27 April 2016); doi: 10.1117/12.2227752; https://doi.org/10.1117/12.2227752


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