Compact, thermal-noise-limited reference cavity for ultra-low-noise microwave generation.

  title={Compact, thermal-noise-limited reference cavity for ultra-low-noise microwave generation.},
  author={Josu{\'e} D{\'a}vila-Rodr{\'i}guez and Fred Baynes and Andrew D. Ludlow and Tara M. Fortier and Holly Leopardi and Scott A. Diddams and Franklyn Quinlan},
  journal={Optics letters},
  volume={42 7},
We demonstrate an easy-to-manufacture 25-mm-long ultra-stable optical reference cavity for transportable photonic microwave generation systems. Employing a rigid holding geometry that is first-order insensitive to the squeezing force and a cavity geometry that improves the thermal noise limit at room temperature, we observe a laser phase noise that is nearly thermal noise limited for three frequency decades (1 Hz to 1 kHz offset) and supports 10 GHz generation with phase noise near -100  dBc/Hz… 

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