Characteristics on coherent combined beam of one dimensional laser diode array in far field

The analytical expression of the far-field light intensity of coherent combined beams was acquired by Fourier method. The far-field characteristics of the coherent combined beam from the one-dimensional phase-locking laser diode array were numerically simulated and experimentally researched. The results show that the peak becomes sharp with the increase of combined beam quantity; the luminous energy of the cophasal mode centralizes into the smaller spatial angle and makes the illumination of the coherent combined beams increased; the luminous energy of the out-phase mode becomes dispersed and the intensity at its peak is reduced due to the jitter of the system, so the symmetry of far field and quality of the beam is affected; and the more numbers of the beams is combined, the less influence of the system jitter on far field becomes.