Influence of chirp pulse parameters on far-field intensity distribution of combined beams

The beam combination is an effective method to improve laser power and beam quality, the parameters of chirped pulsed Gaussian beam will affect the result. Based on the Fraunhofer diffraction integral formula, the formulas for the far-field relative intensity of two chirped pulsed Gaussian beams combination are derived. It is shown that the far-field relative intensity distribution of the combined beams depends on the chirp parameter, pulse duration, and spectral bandwidth. The numerical simulation result of the intensity indicates that, the far-field relative intensity distribution of combined beams increases and is more concentrated in the vicinity of transmission shaft with the increment of chirp parameter or with the decrement of pulse duration difference or the increment of spectral bandwidth difference.