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We demonstrate an easy to manufacture, 25 mm long ultra-stable opticalreference cavity for transportable photonic microwave generation systems.Employing a rigid holding geometry that is first-order insensitive to thesqueezing force and a cavity geometry that improves the thermal noise limit atroom temperature, we observe a laser phase noise that is nearly thermal noiselimited for three frequency decades (1 Hz to 1 kHz offset) and supports 10 GHzgeneration with phase noise near -100 dBc/Hz at 1 Hz offset and <-173 dBc/Hzfor all offsets >600 Hz. The fractional frequency stability reaches$2\times10^{-15}$ at 0.1 s of averaging.

A compact, thermal noise limited reference cavity for ultra-low noise microwave generation