Rotation measurements using a a resonant fiber optic gyroscope based on Kagome fiber

We build a resonant fiber optic gyro based on Kagome hollow-core fiber. A semi-bulk cavity architecture based on a 18-m-long Kagome fiber permits to achieve a cavity finesse of 23 with a resonance linewidth of 700 kHz. An optimized Pound-Drever-Hall servo-locking scheme is used to probe the cavity in reflection. Closed-loop operation of the gyroscope permits to reach an angular random walk as small as 0.004$^\circ/\sqrt{\mathrm{h}}$ and a bias stability of 0.45$^\circ$/h over 0.5 s of integration time.