Marraccini Philip J, Riza Nabeel A
Department of Electrical and Electronic Engineering, University College Cork, College Road, Cork, Ireland.
Rev Sci Instrum. 2011 Dec;82(12):123107. doi: 10.1063/1.3669535.
Presented is a novel design of a multimode laser beam analyzer using a digital micromirror device (DMD) and an electronically controlled variable focus lens (ECVFL) that serve as the digital and analog agile optics, respectively. The proposed analyzer is a broadband laser characterization instrument that uses the agile optics to smartly direct light to the required point photodetectors to enable beam measurements of minimum beam waist size, minimum waist location, divergence, and the beam propagation parameter M(2). Experimental results successfully demonstrate these measurements for a 500 mW multimode test laser beam with a wavelength of 532 nm. The minimum beam waist, divergence, and M(2) experimental results for the test laser are found to be 257.61 μm, 2.103 mrad, 1.600 and 326.67 μm, 2.682 mrad, 2.587 for the vertical and horizontal directions, respectively. These measurements are compared to a traditional scan method and the results of the beam waist are found to be within error tolerance of the demonstrated instrument.
本文介绍了一种新型的多模激光束分析仪设计，该分析仪使用数字微镜器件（DMD）和电控可变焦距透镜（ECVFL），分别作为数字和模拟灵活光学元件。所提出的分析仪是一种宽带激光特性测量仪器，它利用灵活光学元件将光巧妙地引导到所需的点探测器，以实现对最小束腰尺寸、最小束腰位置、发散角和光束传播参数M²的光束测量。实验结果成功地证明了对波长为532nm、功率为500mW的多模测试激光束的这些测量。测试激光的最小束腰、发散角和M²的实验结果在垂直和水平方向上分别为257.61μm、2.103mrad、1.600和326.67μm、2.682mrad、2.587。将这些测量结果与传统扫描方法进行比较，发现束腰结果在已证明仪器的误差容限内。
