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Lasers stabilized to vacuum-gap Fabry-P\'erot optical reference cavitiesdisplay extraordinarily low noise and high stability, with linewidths much lessthan 1 Hz. These lasers can expand into new applications and ubiquitous usewith the development of compact, portable cavities that are manufacturable atscale. Here we demonstrate an 8 mL volume Fabry-P\'erot cavity constructed withmirrors that are fabricated lithographically with finesse near 1 million. Alaser locked to the cavity exhibits phase noise limited by the cavity thermalnoise for offset frequencies ranging from 1 Hz to $\approx$ 1 kHz, with afractional frequency stability of 7$\times$10$^{-15}$ at 1 second. Furthermore,the use of microfabricated mirrors allows us to expand the design space ofcentimeter-scale cavities, and we explore the noise implications of pushingtowards cavity volumes of 2 mL or less.

Thermal noise-limited laser stabilization to an 8 mL volume Fabry-P\'erot reference cavity with microfabricated mirrors