posted on 2023-07-12, 16:01authored byYifan Liu, Charles A. McLemore, Megan Kelleher, Dahyeon Lee, Takuma Nakamura, Naijun Jin, Susan Schima, Peter Rakich, Scott A. Diddams, Franklyn Quinlan
We present an in-vacuum bonded, 9.7 mL-volume Fabry-P\'erot ultrastable optical reference cavity that operates without a vacuum enclosure. A laser stabilized to the cavity demonstrates low, thermal noise-limited phase noise and 5x10^{-14} Allan deviation at 1 second.