Efficient dynamic coherence transfer relying on offset locking using optical phase-locked loop

We design and experimentally demonstrate a highly efficient coherence transfer based on composite optical phase-locked loop comprising multiple feedback servo loops. The heterodyne offset-locking is achieved by conducting an acousto-optic frequency shifter in combination with the current tuning and the temperature controlling of the semiconductor laser. The adaptation of the composite optical phase-locked loop enables the tight coherence transfer from a frequency comb to a semiconductor laser in a fully dynamic manner.