In-Situ Fiber Temperature Sensor for Anti-Stokes Cooling Measurements in Doped Fibers


The experimental study of cooling by anti-Stokes fluorescence in a fiber or a radiation-balanced fiber laser necessitates the development of a sensor that can measure the temperature of the fiber core with an excellent temperature and spatial resolution, a large dynamic range, a small drift, a fast response, and a low absorptive loss. We report an in-situ slow-light fiber sensor written directly in a Yb-doped silica fiber using a femtosecond laser. The sensor has a spatial resolution of 6.5 mm, an excellent measured temperature resolution of 0.9 m°C/ √Hz, and a measured drift as low as 20 m°C/min. One of the grating's slow-light resonances is interrogated with a tunable 1.55-µm laser to measure the temperature-induced shift in the resonance wavelength when the fiber is optically pumped. The laser frequency is also modulated at 30 kHz to greatly reduce the detection noise. The sensor was pumped with 0.58 mW from a 1020-nm laser and measured a positive temperature change of 0.33 °C. The dominant source of heating is shown to be likely the photodarkening loss induced in the Yb-doped fiber when the FBG was written. The total FBG loss is predicted to be ~24 m-1 at 1020 nm and expected to reduce after annealing. Projections indicate that if the loss of the rare-earth doped FBG can be decreased to the level of the loss observed in slow-light FBGs written in SMF-28 fibers, these sensors can be used to measure ASF cooling.

Meeting Name

Optical and Electronic Cooling of Solids III 2018 (2018: Jan. 20-31, San Francisco, CA)


Electrical and Computer Engineering

Keywords and Phrases

Fiber Bragg gratings; Fiber lasers; Fibers; Image resolution; Optically pumped lasers; Pumping (laser); Rare earth-doped fibers; Rare earths; Silica; Single mode fibers; Slow light, Anti-Stokes fluorescence; Fiber temperature sensors; Measured temperatures; Rare earth doped; Resonance wavelengths; Spatial resolution; Temperature changes; Temperature-induced, Electronic cooling

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Article - Conference proceedings

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Publication Date

01 Jan 2018