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Compact, Portable, Thermal-Noise-Limited Optical Cavity with Low Acceleration Sensitivity



Megan Kelleher, Charles McLemore, Dahyeon Lee, Josue Davila-Rodriguez, Scott Diddams, Franklyn Quinlan


We develop and demonstrate a compact (less than 6 mL) portable Fabry-Pérot optical reference cavity. A laser locked to the cavity is thermal noise limited at 2 × 10−14 fractional frequency stability. Broadband feedback control with an electro-optic modulator enables near thermal-noise-limited phase noise performance from 1 Hz to 10 kHz offset frequencies. The additional low vibration, temperature, and holding force sensitivity of our design makes it well suited for out-of-the-lab applications such as optically derived low noise microwave generation, compact and mobile optical atomic clocks, and environmental sensing through deployed fiber networks.
Optics Express


Phase Noise, Optical Cavity, Ultra-stable Laser


Kelleher, M. , McLemore, C. , Lee, D. , Davila-Rodriguez, J. , Diddams, S. and Quinlan, F. (2023), Compact, Portable, Thermal-Noise-Limited Optical Cavity with Low Acceleration Sensitivity, Optics Express, [online],, (Accessed June 17, 2024)


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Created March 23, 2023, Updated June 7, 2024