Long-term stable coherent beam combination of independent femtosecond Yb-fiber lasers.

Abstract

We demonstrate coherent beam combination between independent femtosecond Yb-fiber lasers by using the active phase locking of relative pulse timing and the carrier envelope phase based on a balanced optical cross-correlator and extracavity acoustic optical frequency shifter, respectively. The broadband quantum noise of femtosecond fiber lasers is suppressed via precise cavity dispersion control, instead of complicated high-bandwidth phase-locked loop design. Because of reduced quantum noise and a simplified phase-locked loop, stable phase locking that lasts for 1 hour has been obtained, as verified via both spectral interferometry and far-field beam interferometry. The approach can be applied to coherent pulse synthesis, as well as to remote frequency comb connection, allowing a practical all-fiber configuration.

DOI: 10.1364/OL.41.005142

Cite this paper

@article{Tian2016LongtermSC, title={Long-term stable coherent beam combination of independent femtosecond Yb-fiber lasers.}, author={Haochen Tian and Youjian Song and Fei Meng and Zhanjun Fang and Minglie Hu and Chingyue Wang}, journal={Optics letters}, year={2016}, volume={41 22}, pages={5142-5145} }