Far-field characteristics of diode laser bar beam

The far-field characteristics of a diode laser bar(DLB) (type JOLD-60-CPNN-1L) beam are studied both experimentally and theoretically. Experiments show that beams emitted from the 19 diodes, which compose the DLB, propagate nearly independently. The far-field intensity distribution of the DLB can be treated as the incoherent superposition of 19 individual beamlets and does not vary with time. The distances between the illumination zones are unequal. The theoretical model is improved in accordance with the experiments. The experimental results at low input current are compared with the numerical calculation results using the improved theoretical model and they are consistent with each other.