title: Compact, thermal-noise-limited reference cavity for ultra-low-noise microwave generation.
abstract: 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 at 1 Hz offset and <-173  dBc/Hz for all offsets >600  Hz. The fractional frequency stability reaches 2×10-15at 0.1 s of averaging.
authors.forename: J
authors.initials: J
authors.lastname: Davila-Rodriguez
authors.forename: F N
authors.initials: FN
authors.lastname: Baynes
authors.forename: A D
authors.initials: AD
authors.lastname: Ludlow
authors.forename: T M
authors.initials: TM
authors.lastname: Fortier
authors.forename: H
authors.initials: H
authors.lastname: Leopardi
authors.forename: S A
authors.initials: SA
authors.lastname: Diddams
authors.forename: F
authors.initials: F
authors.lastname: Quinlan