【作者】 张利平； 陈建国； 杨华； 陈海波； 钱凌轩； 施鹏程；

【Author】 ZHANG Li-ping CHEN Jian-guo YANG Hua CHEN Hai-bo QIAN Ling-xuan SHI Peng-cheng (Department of Optoelectronics.Sichuan University.Chengdu.Sichuan 610064,China)

【机构】 四川大学光电系；

【摘要】 对外腔锁相半导体激光器阵列(LDA)各阶超模远场的光强分布进行了分析。超摸远场的光瓣呈周期性分布,光瓣之间分布着等间距的次峰,一般情况下次峰强度远小于光瓣强度。两个光瓣对之间的距离等于激光波长λ和相邻两发光单元中心间距 d 的比值,而每一对光瓣的间距由超模阶数决定。最低阶超模(LSM)和最高阶超模 (HSM)的光瓣两两相连,而且相连光瓣间存在着一个光强更大的次峰,两个光瓣和一个次峰组成一个复合光瓣,因此最低阶和最高阶超模的光瓣数目比中间阶超模减少了一半。对于中间阶超模,距离光瓣较近的次峰强度较大, 而较远的光强较小。基模与最高阶超模的远场分布相似,但复合光瓣相对移动了距离λ/(2d)。更多还原

【Abstract】 Far fields of super-modes(SMs)from an external cavity phase locked high power laser diode array(LDA)are studied. The super-mode far-field lobes shows periodical distribution,and there are spikes with the equivalent spacing between two lobes.The intensity of the spike is generally much less than that of the lobe.The angular spacing between two neighboring pairs of lobes is equal to the ratio of lasing wavelength λ to the distance d between the centers of two adjacent emitters,and the angular spacing of the lnbes of each pair depends on the order of super-mode.For the lowest order super-mode(LSM)and highest order super-mode (HSM).there are even larger spikes between two closely spaced lobes resulting in composite lobes so that the number of lobes is reduced to a half of that of the other orders super-modes.For other super-modes,the intensity of the spike nearer to the lobe is larger and that of the farther is smaller.The far-field distribution of the lowest order super-mode is similar to that of the highest order one but of an angular diapalcement of λ/(2d).更多还原