Laser beam quality is an important parameter to evaluate the spatial characteristics of laser field. Based on the Wigner distribution function, the beam quality characteristics of one-dimensional field are analyzed and the beam quality factor is divided into intensity term, wavefront term and coherence term. The model shows that the incoherence in laser field affects the coherence term of the beam quality through the incoherence coefficient k(x1,y1,x2,y2), and then affects the beam quality of the whole field. The beam quality evolution trend of diode lasers with mode hopping or multi-mode in longitudinal mode is analyzed by simulation. It is shown that when the order of longitudinal modes in the laser increases, the influence on the beam quality is related to the laser field distribution, the depravation of beam quality is proportionally related with the transverse mode component of diode lasers.
To improve the heat management of high-power diode lasers, a microchannel heat sink is obtained, whose structure is optimized in method of numerical simulation. Following such a design, the microchannel heat sink is fabricated by nickel-based doping rare earth materials by laser three-dimensional (3-D) printing procedure. Since the noncorrosion property of such material has been preliminarily demonstrated by salt spray test, there is no necessity to plate the interior of the laser 3-D printing microchannel heat sink with gold. The coefficient of thermal expansion of such material is 11 ppm/K. The diode laser array (LDA) with 80-W cw output power, 2-mm cavity length, 100-μm emitter width, and 20% fill-factors is mounted on it for the thermal resistance test, and the result is 0.40 K/W. Moreover, the smile effect of the mounted LDA is merely 0.8 μm.
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