We demonstrate experimentally the application of a phase error detection method in the coherent beam combination (CBC) of a laser array. The method is based on the Hartmann micro-lens array. Both the piston and tilt errors can be detected and corrected simultaneously by combining this method with adaptive optics-correcting technology. The far-field intensity pattern of the combined beam has high energy concentration and good beam quality. The power encircled in the main lobe of the far-field pattern is 41.3%, and the contrast of the pattern reaches 81.8%. Experimental results show the great potential of the Hartmann phasing method for use in the CBC of a large number of laser beams.
© 2012 Chinese Optics Letters
Lasers and Laser Optics
Xiaohua Wang, Qiang Fu, Linhai Huang, Feng Shen, and Changhui Rao, "Experimental research on application of Hartmann micro-lens array in coherent beam combination of two-dimensional laser array," Chin. Opt. Lett. 10, 081402- (2012)