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Space-borne optical frequency references based on spectroscopy of atomicvapors may serve as an integral part of compact optical atomic clocks, whichcan advance global navigation systems, or can be utilized for earth observationmissions as part of laser systems for cold atom gradiometers. Nanosatellitesoffer low launch-costs, multiple deployment opportunities and short payloaddevelopment cycles, enabling rapid maturation of optical frequency referencesand underlying key technologies in space. Towards an in-orbit demonstration onsuch a platform, we have developed a CubeSat-compatible prototype of an opticalfrequency reference based on the D2-transition in rubidium. A frequencyinstability of 1.7e-12 at 1 s averaging time is achieved. The optical moduleoccupies a volume of 35 cm^3, weighs 73 g and consumes 780 mW of power.

A Prototype of a Compact Rubidium-Based Optical Frequency Reference for Operation on Nanosatellites