Information in Optical Speckle

光学散斑中的信息Kevin Webb，普渡大学本研究的目的是研究相干光通过散射介质传播时产生的光学散斑中的信息。该方法是，在适度散射的情况下，测量来自样品的偏振相关的散射光，然后将其与散射的模型相关联。散斑在空间和频率上的相关性将被用来研究通过散射介质的通信能力。散射样品的近场将被测量，允许本地化现象进行研究。随机增益介质将使用合适的和可用的激光泵浦制造和测试，空间散斑和光谱特性将被测量。智力优点：许多物理问题都有散射和散斑的形式，具有适当的相干性。拟议中的工作将导致增强组织成像和环境传感，以改善在杂乱（散射）环境中的通信，并更好地了解随机laser.broader影响：组织的光学成像可以提供一个安全和廉价的手段，以改善诊断和健康监测。通过散射环境的传感和通信可能会受到这种散射的限制，并且容量的提高将对科学研究和个人无线通信产生广泛的影响。显示技术可以通过使用具有适当相干特性的光源和具有适当散射的介质来改进，如将研究的。两名研究生和一名本科生将从事该项目。

Information in Optical SpeckleKevin Webb, Purdue UniversityThe objective of this research is to investigate the information in optical speckle arising from propagation of coherent light through scattering media. The approach is, in the case of modest scatter, to measure the polarization-dependent scattered light from samples, and then relate this to a model for the scatter. Speckle correlations in space and frequency will be used to investigate the communication capacity through scattering media. The near field of scattering samples willbe measured, allowing localization phenomena to be studied. Random gain media will be fabricated and tested using a suitable and available laser pump, and the spatial speckle and spectral characteristics will be measured.Intellectual merit:Many physical problems have scatter and, with suitable coherence, speckle forms. The proposed work will lead to enhanced tissue imaging and environmental sensing, to improved communication in cluttered (scattering) environments, and to a better understanding of random lasers.Broader impact:Optical imaging of tissue can provide a safe and inexpensive means to improve diagnosis and health monitoring. Sensing and communicating through a scattering environment can be limited by this scatter, and improvements in capacity will have broad impact on scientific studies and personal wireless communication. Display technology can be improved through use of light source with suitable coherence properties and media with appropriate scatter, as will be studied. Two graduate students and one undergraduate will work on the project.