Abstract
We proposed a novel beam combining technique for coherent laser arrays that uses a conjugate Dammann grating (CDG) and a phase plate. By using this technique, a coherent laser array can be not only coherently combined to a single beam but also aperture filled to a far field single central lobe beam by means of phase compensation in theory. The aperture size and power density of the combined beam can be conveniently changed. Moreover, the technique applies for both binary and continuous amplitude profiles emitted from an individual laser of laser arrays, especially Gaussian beam. An verified experiment with a simulated 5×5 coherent laser array using an aperture mask was performed that effectively verified the feasibility of the proposed concept. This new method has the potential for scaling to much higher output powers with good beam quality by coherent combination and aperture filling of coherent laser arrays in practical applications.
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