为了便于对半导体激光器阵列(LDA)光束整形系统的设计和光束质量的评价,研究了目前LDA应用时普遍存在的问题,即Bar条不发光现象对LDA光强分布等特性的影响。基于LDA中单个发光单元的远场双峰结构,建立了描述LDA远场分布的数学模型,在LDA能量分布95%的主要区域内,该理论模型拟合测量数据的误差<5%。结合该理论模型和对LDA光束特性的实验测试结果,分析了Bar条不发光对LDA光强分布模式以及其它光束特性的影响。结果表明,在传输达到一定距离后,单个或几个Bar条不发光不会改变LDA光强分布模式双峰结构的本质,但对于光强分布的其它特性,如峰值光强大小、峰值光强位置、中心轴光强大小都会产生影响。LDA的功率特性与不发光Bar条的数目呈反比,与不发光Bar条的位置无关。

In order to design the beam-shaping system of Laser Diode Arrays(LDA) and to evaluate the beam quality of LDA availably,effects of non-luminescence of Bar on beam properties of LDA were studied.Based on farfield bi-peak structure of an emitter,a far-field expression model of LDA was proposed.The simulation results agree well with the measured data and the overall error of this model is less than 5% in the more than 95% power region.On the base of this theoretical model and measured data,effects of non-luminescence of Bar on intensity distribution and other properties of LDA were analyzed.The results show that non-luminescences of single Bar or several Bars can not change the far-field bi-peak of LDA after beam transmission exceeds a certain distance,but it can effect on other properties such as peak intensity,the position of peak intensity and the intensity on center axis.The power of LDA is inversely proportion to the number of non-luminescent Bars and do not be effected by position variety of non-luminescent bars.