Impact of fill factor on collimation of diode laser stack slow axis beam

In order to realize the beam shaping of high-power diode laser stack by microlens array, the technique of high-power diode laser stack slow axis direction beam collimation is researched, the high-power diode laser stack is accompanied with micro-cylindrical-lens of fast axis collimation. On the basis of the analysis of the slow axis direction beam collimation, the impact of fill factor in the slow axis on the beam collimation is studied chiefly, and the collimating programs of diode lasers with different fill factors are analyzed. Using the bar as the collimating unit for the high-power diode laser stack with the fill factor 0.5, we test the remaining divergence angle of slow axis direction beam after collimation by the testing equipment based on space scanning, and achieve the half of the remaining divergence angle 2.12. The experimental results show that the collimating way of diode laser slow axis direction beam is effective.