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Superimposing interferogram method using a multi-slit array to enhance sensitivity and interference definition of spatial-phase-shift interferometers
Optical Review ( IF 1.2 ) Pub Date : 2020-10-27 , DOI: 10.1007/s10043-020-00626-4
Natsumi Kawashima , Tomoya Kitazaki , Kosuke Nogo , Akira Nishiyama , Kenji Wada , Ichiro Ishimaru

We propose a superimposing interferogram method to enhance the sensitivity and interference definition of spatial-phase-shift interferometers. The proposed method uses a multi-slit array as a redesigned field stop for the spatial-phase-shift interferometer. The widths of the apertural and blocked areas correspond to half the wavelength of the fringe pattern on the imaging plane and determine the wavelength that improves the interference definition while eliminating those wavelengths that worsen it, thus improving the interference definition of the interferogram. Additionally, to improve the interferometer’s sensitivity, several apertural areas were aligned to increase the amount of incident light. We performed spectroscopic measurements and confirmed improvements in both the sensitivity and the interference definition using a prototype of a bean-sized mid-infrared spectroscopic imager based on a one-shot Fourier spectroscope and a prototype multi-slit array. Although mid-infrared light is absorbed well by water and its intensity is thus weak for detection using the array sensors of cameras, mid-infrared spectroscopic imagers that incorporate our proposed method can be used for biomedical measurements of samples containing water.



中文翻译:

使用多缝阵列的叠加干涉图方法可提高空间相移干涉仪的灵敏度和干涉清晰度

我们提出一种叠加干涉图方法,以提高空间相移干涉仪的灵敏度和干涉清晰度。所提出的方法使用多缝阵列作为空间相移干涉仪的重新设计的场阑。孔径区域和遮挡区域的宽度对应于成像平面上条纹图案波长的一半,并确定了改善干涉清晰度的波长,同时消除了使干涉清晰度恶化的那些波长,从而改善了干涉图的干涉清晰度。此外,为了提高干涉仪的灵敏度,将几个孔区域对齐以增加入射光量。我们使用基于单次傅里叶光谱仪和原型多缝阵列的Bean大小的中红外光谱成像仪的原型,进行了光谱测量并确认了灵敏度和干扰清晰度的改进。尽管中红外光被水很好地吸收,因此其强度很弱,无法使用相机的阵列传感器进行检测,但是结合了我们提出的方法的中红外光谱成像仪可用于对含水样品进行生物医学测量。

更新日期:2020-10-30
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