Gigahertz Harmonic Mode-Locking of Fiber Laser Stabilized by Acoustic Resonances in Silica Microfiber

We use intense optoacoustic interactions involving the acoustic resonances confined in high-quality 51-cm-long silica microfibers to stabilize the harmonic mode-locking of fiber lasers at gigahertz repetition rates, which is controllable via tuning the microfiber thickness.