积分球散斑图的波长灵敏度
Wavelength sensitivity of the speckle patterns produced by an integrating sphere
摘要：
散斑计量是波长和光谱测量的有力工具。最近，由积分球内的多次反射产生的散斑已经被提出并显示出高性能。然而，据我们所知，散斑的波长在该几何形状的灵敏度的完整表征尚未进行。在这项工作中，我们推导出一个通用的模型预测作为一个通用的变换的结果在斑点图案的变化。将其应用于入射波长的偏移，我们表明散斑灵敏度主要取决于球体的半径和表面反射率。我们发现，积分球提供灵敏度三个数量级以上的多模光纤的类似大小，并讨论类比与传输线的法布里-珀罗干涉仪。
英文摘要：
Speckle metrology is a powerful tool in the measurement of wavelength and spectra. Recently, speckle produced by multiple reflections inside an integrating sphere has been proposed and showed high performance. However, to our knowledge, a complete characterisation of speckle sensitivity to wavelength in that geometry has not been performed to date. In this work, we derive a general model predicting the variation in a speckle pattern as a result of a generic transformation. Applying this to a shift in the incident wavelength, we show that the speckle sensitivity is mainly governed by the radius and surface reflectivity of the sphere. We show that integrating spheres offer sensitivity three orders of magnitude above that of multimode fibres of a similar size, and discuss analogies with the transmission line of a Fabry-Pérot interferometer.
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