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首页> 外文期刊>Optical review >Angular dependence of screen speckle and fiber speckle of coupled output of nine high-power blue laser diodes through a multi-mode fiber
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Angular dependence of screen speckle and fiber speckle of coupled output of nine high-power blue laser diodes through a multi-mode fiber

机译：九个大功率蓝色激光二极管通过多模光纤的耦合输出的屏幕散斑和光纤散斑的角度相关性

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摘要

Angular dependence of speckle contrast of speckle pattern projected out of a multi-mode fiber connected to a high-power blue laser module is investigated. The laser module has nine high-power InGaN/GaN blue laser diodes arranged in a three-by-three array. Each of the arrayed laser diodes have slightly different incident angle to the fiber. We have successfully extracted the fine screen speckle pattern from the projected pattern mixed up with the coarse fiber speckle pattern by processing the measured data. It is found that the speckle contrast of the both screen and fiber speckles are larger around the center area where the guided-light component closest to the paraxial direction is projected. This is because the output of the center laser in the array is likely to couple into the paraxial mode more than the rest. Speckle contrast behaviors when applying the speckle reduction methods, fiber vibration, diffuser, and spinning diffuser are also investigated.
机译：研究了从连接到高功率蓝色激光模块的多模光纤中投射出来的散斑图案散斑对比度的角度依赖性。激光模块具有以三乘三的阵列排列的九个高功率InGaN / GaN蓝色激光二极管。每个阵列的激光二极管与光纤的入射角略有不同。通过处理测量数据，我们已经成功地从与粗纤维斑点图案混合的投影图案中提取了精细的屏幕斑点图案。发现，在投影最接近近轴方向的导光分量的中心区域附近，屏幕斑点和纤维斑点的斑点对比度都较大。这是因为阵列中中心激光器的输出可能比其余的耦合到近轴模式。还研究了应用斑点减少方法，纤维振动，扩散器和旋转扩散器时的斑点对比度行为。

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