A 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 $2\times 10^{-15}$ at 0.1 s of averaging.

Letter

References in corpus (4)

• Photonic microwave signals with zeptosecond level absolute timing noise
• Ultra-stable optical clock with two cold-atom ensembles
• Sub-Hz line width diode lasers by stabilization to vibrationally and thermally compensated ULE Fabry-Perot cavities
• Tuning the Thermal Expansion Properties of Optical Reference Cavities with Fused Silica Mirrors

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