7 March 2016 Bottle micro-resonator temperature sensors for laser coolers
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Abstract
We show theoretically that a bottle resonator with a nanoscale altitude made on the surface of an optical fiber can be used as a temperature sensor for laser cooling of solids. The operation of such sensors is based on whispering gallery modes (WGMs). Bottle resonators can be made at different positions along the length of the fiber, which undergoes laser cooling. A smooth perturbation with a small nanoscale altitude on the surface of the fiber does not couple fiber modes propagating along the fiber axis and does not influence the laser cooling process. The temperature of the sample at each of these positions can be monitored as a shift in the dips seen in the transmission spectrum of a biconically tapered fiber placed perpendicular to the fiber axis on the top of the resonator to excite WGMs. Temperature sensitivities ~12pm/K and ~16pm/K are obtained for Yb3+:ZBLAN and Yb3+:YAG samples, respectively. The possibility of using bottle resonators for other applications is also discussed.
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Galina Nemova, Raman Kashyap, "Bottle micro-resonator temperature sensors for laser coolers", Proc. SPIE 9765, Optical and Electronic Cooling of Solids, 97650M (7 March 2016); doi: 10.1117/12.2212811; https://doi.org/10.1117/12.2212811
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