Abstract
This Letter reports a slow-light fiber Bragg grating (FBG) temperature sensor with a record temperature resolution of , a drift of only over the typical duration of a measurement (), and negligible self-heating. This sensor is particularly useful for applications requiring the detection of very small temperature changes, such as radiation-balanced lasers and the measurement of small absorptive losses using calorimetry. The sensor performance is demonstrated by measuring the heat generated in a pumped Yb-doped fiber. The sensor is also used to measure the slow-light FBG’s very weak internal absorption loss (), which is found to be only of the total loss.
© 2018 Optical Society of America
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