EXPRESS: Suppressing the Multiplex Disadvantage in Photon-Noise-Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry
EXPRESS: Suppressing the Multiplex Disadvantage in Photon-Noise-Limited Interferometry Using Cross-Dispersed Spatial Heterodyne Spectrometry
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EXPRESS：使用交叉色散空间外差光谱法抑制光子噪声限制干涉测量中的多重缺点
DOI：
10.1177/0003702820946739
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发表时间：
2020
影响因子：
3.5
通讯作者：
Sharma, Shiv
中科院分区：
文献类型：
--
作者：
Egan, Miles J.;Colón, Arelis;Angel, S. Michael;Sharma, Shiv
空间外差光谱仪是静态傅立叶变换光谱仪的成员，因其在紧凑、轻足迹封装中获得高分辨率、高波长精度发射光谱的能力而受到好评。在空间外差光谱仪实验中，对给定光谱中的每一个光谱特征生成一条菲索条纹，空间外差光谱仪将光谱中所有菲索条纹的叠加记录在检测器上。因此，空间外差光谱仪的灵敏度受到不相关的、倍增的光子噪声的限制，这种噪声将光谱特征的检测限制在比探测器上的总入射通量的平方根更亮的光谱特征上。本质上，强大的光谱特征会产生一个上升的噪声底，从而洗掉不那么明亮的特征。在本工作中，我们引入了一种新的光谱仪耦合，即Amici棱镜光谱仪与空间外差光谱仪串联，它沿探测器的一个轴将光子散射噪声关联起来，从而抑制干涉图图像每一行内的倍增光子噪声。我们证明了这种光谱仪配对有助于测量弱拉曼光谱特征，在传统的空间外差光谱仪测量中，这些特征会被倍增光子噪声洗掉。
Spatial heterodyne spectrometers are members of the static Fourier transform class of spectrometers, well-regarded for their ability to acquire high-resolution, high wavelength precision emission spectra in compact, light footprint packages. In a spatial heterodyne spectrometer experiment, a Fizeau fringe is generated for every spectral feature in a given spectrum, and spatial heterodyne spectrometer records the superposition of all Fizeau fringes in the spectrum on a detector. Hence, the sensitivity of spatial heterodyne spectrometers is constrained by uncorrelated, multiplicative photon noise that limits the detection of spectral features to those that are more luminous than the square root of the total incident flux onto the detector. In essence, powerful spectral features create a rising floor of noise that wash out less luminous features. In the present work, we introduce a novel spectrometer coupling, that being an Amici prism spectrometer in series with spatial heterodyne spectrometer, that correlates photon shot noise along one axis of a detector that in turn suppresses multiplicative photon noise within each row of the interferogram image. We demonstrate that this spectrometer pairing facilitates the measurement of weak Raman spectral features that, in a traditional spatial heterodyne spectrometer measurement, would be washed out by multiplicative photon noise.