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Optical frequency standards, lasers stabilized to atomic or moleculartransitions, are widely used in length metrology and laser ranging, provide abackbone for optical communications and lie at the heart of next-generationoptical atomic clocks. Here we demonstrate a compact, low-power opticalfrequency standard based on the Doppler-free, two-photon transition inrubidium-87 at 778 nm implemented on a micro-optics breadboard. The opticalstandard achieves a fractional frequency stability of2.9x10$^{-12}$/$\sqrt{\tau}$ for averaging times $\tau$ less than 10$^{3}$ s,has a volume of $\approx$35 cm$^3$ and operates on $\approx$450 mW ofelectrical power. These results demonstrate a key step towards the developmentof compact optical clocks and the broad dissemination of SI-traceablewavelength references.

Miniaturized optical frequency standard for next-generation portable optical clocks