Incoherent excess noise spectrally encodes broadband light sources.
Incoherent excess noise spectrally encodes broadband light sources.
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DOI：
10.1038/s41377-020-00404-6
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Srinivasan VJ
中科院分区：
文献类型：
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作者：
Kho AM;Zhang T;Zhu J;Merkle CW;Srinivasan VJ
在光学和光子学领域，过度的强度噪声通常被认为是一种不利因素。在这里，我们表明，在宽带超连续谱和超辐射发光二极管光源的过量噪声编码每个光谱通道具有独特的强度波动，这实际上是一个有用的目的。具体来说，我们报告说，过量的噪声相关性可以表征光谱仪的光谱分辨率，并使交叉校准的波长在一个很宽的带宽。相对于以前的方法，使用宽带干涉和窄线宽激光器来表征和校准光谱仪，我们的方法是简单，全面，快速，足以部署在光谱仪对准。首先，我们采用这种方法来帮助对齐和减少基于光谱仪的光学相干断层扫描（OCT）系统的灵敏度和轴向分辨率的深度依赖性退化，揭示了一个新的外视网膜带。其次，我们实现了两个不同的光谱仪之间的像素到像素的对应关系，使其各自的测量结果的鲁棒性比较。因此，过量强度噪声在光学和光子学中具有有用的应用。
Across optics and photonics, excess intensity noise is often considered a liability. Here, we show that excess noise in broadband supercontinuum and superluminescent diode light sources encodes each spectral channel with unique intensity fluctuations, which actually serve a useful purpose. Specifically, we report that excess noise correlations can both characterize the spectral resolution of spectrometers and enable cross-calibration of their wavelengths across a broad bandwidth. Relative to previous methods that use broadband interferometry and narrow linewidth lasers to characterize and calibrate spectrometers, our approach is simple, comprehensive, and rapid enough to be deployed during spectrometer alignment. First, we employ this approach to aid alignment and reduce the depth-dependent degradation of the sensitivity and axial resolution in a spectrometer-based optical coherence tomography (OCT) system, revealing a new outer retinal band. Second, we achieve a pixel-to-pixel correspondence between two otherwise disparate spectrometers, enabling a robust comparison of their respective measurements. Thus, excess intensity noise has useful applications in optics and photonics.