半导体激光器线阵光束扭转对称化的实验研究

利用双焦望远系统和扭转柱透镜系统实现了半导体激光器线阵(LD-bar)的扭转对称化，对称化后的光束在x和y两个方向的光束宽度、发散角和光束参量积接近相等，极大地改善了半导体激光器线阵光束的不对称性和像散特性，进行了以上变换的理论分析和实验研究。作为应用实例．用对称变换后的光束进行了抽运固体激光器的实验，激光器基模输出的效率比用不变换前的光束有明显提高。

Study of Twisted Beam Symmetrization from Laser Diode Bar

A principal drawback of high-power laser diode, which limits their applications such as pumping solid-state laser and fiber laser, is astigmatic brightness of output beam. The astigmatic beam emitted from laser diode bar is transformed into a beam with twisted symmetry by using a bifocal telescope and rotated cylindrical lenses. The beam widths, divergences and the beam parameter products of the symmetrized beam are nearly the same in x and y directions. The beam transformation was theoretically analyzed and experimentally studied. As an example, the symmetrized beam was used to pump solid state laser. The efficiency of the fundamental mode operation was improved compared with the result of untransformed beam pumping.