We present a flat-top laser beam generation scheme using coherent beam combining of hexagonally arranged Gaussian lasers. To produce a beam with a flat-top profile, we optimize the amplitude and phase of each unit laser using the least-square method. Simulation results show that with 13 unit lasers, a beam with the flatness of less than 1% in the optimizing region can be achieved. The main lobe contains over 95% of the total power. The scheme requires no external beam shaping element and has the potential to be designed for high-power applications.
© 2010 Chinese Optics Letters
Kun Gao, Lixin Xu, Rui Zheng, Guoliang Chen, Huan Zheng, and Hai Ming, "Flat-top laser beam generated by coherent beam combining of Gaussian lasers," Chin. Opt. Lett. 8, 45-47 (2010)