Speckle reduction using a motionless diffractive optical element.
Speckle reduction using a motionless diffractive optical element.
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DOI：
10.1364/ol.35.002852
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发表时间：
2010-09
期刊：
影响因子：
3.6
通讯作者：
G. Ouyang;Z. Tong;M. N. Akram;Kaiying Wang;V. Kartashov;Xin Yan;Xuyuan Chen
中科院分区：
文献类型：
--
作者：
G. Ouyang;Z. Tong;M. N. Akram;Kaiying Wang;V. Kartashov;Xin Yan;Xuyuan Chen
先前已经在具有相干光源（诸如激光器）的显示系统中研究了通过移动漫射器的散斑减少。在这封信中，我们提出了一个不动的衍射光学元件（DOE）的散斑减少。DOE的设计基于有限元方法模拟，使用微机械加工技术制造，并具有去斑效率。实验表明，采用双光栅的DOE，散斑抑制率可达50%，与理论分析基本一致。通过对该DOE的一些改进，理论上可以将散斑噪声降低到10%。
Speckle reduction by moving diffuser has been previously studied in display systems with coherent light sources, such as lasers. In this Letter, we propose a motionless diffractive optical element (DOE) for speckle reduction. The DOE was designed based on finite-element method simulations, fabricated using micromachining technology, and characterized for despeckle efficiency. Experiments using a DOE with two gratings have indicated that the speckle was suppressed to 50%, which shows fair agreement with theoretical analysis. With some modification of this DOE, the speckle noise can be reduced to 10% according to the theory.