Ultra-sensitive lithium niobate thermometer based on a dual-resonant whispering-gallery-mode cavity.

@article{Weng2018UltrasensitiveLN,
  title={Ultra-sensitive lithium niobate thermometer based on a dual-resonant whispering-gallery-mode cavity.},
  author={Wenle Weng and Philip S. Light and Andre Nicholas Luiten},
  journal={Optics letters},
  year={2018},
  volume={43 7},
  pages={
          1415-1418
        }
}
We exploit the strong polarization dependence of the thermooptic coefficients in a lithium niobate whispering-gallery-mode resonator to create a self-referenced thermometer. An unprecedented temperature sensitivity of 3.0 GHz/K in the frequency difference between modes of orthogonal polarizations is demonstrated. In order to lock the lasers to the mode resonances, we use a simple intracavity phase modulation approach that provides for superbly low frequency instability. We demonstrate a record… CONTINUE READING

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