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We develop and demonstrate a compact (less than $6$ mL) portableFabry-P\'{e}rot optical reference cavity. A laser locked to the cavity isthermal noise limited at $2\times10^{-14}$ fractional frequency stability.Broadband feedback control with an electro-optic modulator enables nearthermal-noise-limited phase noise performance from $1$ Hz to $10$ kHz offsetfrequencies. The additional low vibration, temperature, and holding forcesensitivity of our design makes it well suited for out-of-the-lab applicationssuch as optically derived low noise microwave generation, compact and mobileoptical atomic clocks, and environmental sensing through deployed fibernetworks.

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