Buric Michael P, Falk Joel, Woodruff Steven D
National Energy Technology Laboratory, 3610 Collins Ferry Road, P.O. Box 880, Morgantown, West Virginia 26507-0880, USA.
Appl Opt. 2010 Feb 1;49(4):739-44. doi: 10.1364/AO.49.000739.
To achieve high output power and/or high efficiencies, laser systems are often designed to operate with either high-order or multiorder transverse modes. This comes at the expense of beam quality. Herein, a technique for converting the two lobes of a higher-order (Hermite-Gaussian TEM(10)) beam into two TEM(00) beams is discussed. It is shown that nearly 94% of the power in a single lobe of the TEM(10) beam spatially overlaps an appropriately chosen TEM(00) beam. Beam quality (defined by the M(2) beam quality factor) is increased by separating the two TEM(10) lobes with an edge aperture. A single-mode optical fiber can be used as a spatial filter to eliminate residual higher-order mode content. This study suggests that more than 90% of the power in a TEM(10) beam can be converted into two separate TEM(00) beams.
为了实现高输出功率和/或高效率，激光系统通常设计为以高阶或多阶横向模式运行。这是以光束质量为代价的。在此，讨论了一种将高阶（厄米-高斯TEM(10)）光束的两个瓣转换为两个TEM(00)光束的技术。结果表明，TEM(10)光束单个瓣中近94%的功率在空间上与适当选择的TEM(00)光束重叠。通过用边缘孔径分离两个TEM(10)瓣来提高光束质量（由M(2)光束质量因子定义）。单模光纤可用作空间滤波器以消除残余的高阶模式成分。该研究表明，TEM(10)光束中超过90%的功率可转换为两个单独的TEM(00)光束。
