Article
Optics
Qihang Chu, Xiaotian Li, Jirigalantu, Ci Sun, Jun Chen, Jianing Wang, Yuqi Sun, Bayanheshig
Summary: This paper presents a cross-dispersed spatial heterodyne spectrometer (CDSHS) that combines a spatial heterodyne spectrometer (SHS), a reflection grating, and a cylindrical lens. It provides expressions for the width, height, and location of the cross-dispersed interferograms corresponding to narrow spectral regions. A design example of CDSHS, including numerical simulations of the interferogram and the spectrum, is provided to illustrate the system. The results demonstrate that the CDSHS can simultaneously disperse different narrow spectral regions and obtain detailed spectra independently with a high signal-to-noise ratio, while maintaining advantages such as high resolution, high throughput, compactness, and zero moving parts. The CDSHS has great potential in applications such as multiple spectral feature measurement and weak spectral measurements.
Article
Instruments & Instrumentation
Luca Ciaffoni, Pavel Matousek, William Parker, Elin A. McCormack, Hugh Mortimer
Summary: This study presents a generic analytical model for comparing the detection performance of Raman spectrometers based on grating and spatial heterodyne designs. It shows that the SNR ratio between the two types of spectrometers can vary by two orders of magnitude, with spatial heterodyne spectrometers potentially competing with compact grating designs in delivering comparable detection performance in a much smaller footprint.
APPLIED SPECTROSCOPY
(2021)
Article
Optics
Qinghua Yang
Summary: The B-2HSR-FIS is a flexible imaging spectrometer that combines high spatial and spectral resolution, broadband spectral range, and moderate field angle, making it a powerful tool for applications like vision intelligence in robotics.
Article
Instruments & Instrumentation
Abigail Waldron, Ashley Allen, Arelis Colon, J. Chance Carter, S. Michael Angel
Summary: The mSHRS is a compact and stable monolithic Raman spectrometer that offers high spectral resolution and high light throughput.
APPLIED SPECTROSCOPY
(2021)
Article
Spectroscopy
K. Alicia Strange Fessler, Abigail Waldron, Arelis Colon, J. Chance Carter, S. Michael Angel
Summary: Three spatial heterodyne Raman spectrometers, including one free standing and two monolithic, were utilized for remote Raman and LIBS testing on samples at different distances, as well as 1D Raman imaging. The study demonstrated that using large laser spots can reduce sample photodegradation during Raman testing, while 1D imaging provides better signal-to-noise ratio spectra.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2021)
Article
Optics
Hongnan Xu, Yue Qin, Gaolei Hu, Hon Ki Tsang
Summary: This paper presents a spectrometer design that surpasses the resolution-bandwidth limit, by tailoring the dispersion of mode splitting in a photonic molecule to identify spectral information at different free-spectral ranges (FSRs). Experimental results demonstrate that this approach can resolve arbitrary spectra with discrete, continuous, or hybrid features.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Shuntaro Tani, Kei Sugiyama, Takashi Sukegawa, Tatsuro Sato, Yuya Ishizuka, Soichi Taya, David Feng, Osamu Komeda, Hiroyuki Suto, Hiroaki Saitoh, Yohei Kobayashi
Summary: We developed a mid-infrared spectroscopy system with high spectral resolution and a high signal-to-noise ratio. Our proposed method improved the signal-to-noise ratio and achieved high ratios even in the presence of fluctuations in the light source and environment.
Article
Optics
Xiangzhe Zhang, Liqing Huang, Jingping Zhu, Ning Zhang, Kang Zong, Lipeng Zhai, Yu Zhang, Yakun Cai, Huimin Wang
Summary: The OPD equations of dual Wollaston prisms with an adjustable air gap are derived using the wave normal tracing method, and their validity is verified. The performance of a novel static birefringent Fourier transform imaging spectrometer based on these prisms is investigated.
Article
Chemistry, Multidisciplinary
Yuqi Sun, Xiaotian Li, Jiri Galantu, Qihang Chu, Jun Chen, Zhongkai Liu, Xiaotao Mi, Xuefeng Yao, Pan Li
Summary: A method for measuring the terahertz Raman spectra of materials was proposed, utilizing an inexpensive excitation source and detector as an alternative to costly THz equipment. With a resolution of 4.945 cm(-1) and spectral range of 2531.84 cm(-1), the system showed good stability and repeatability, unaffected by interference from the water environment. This method has potential applications in material detection and environmental protection.
APPLIED SCIENCES-BASEL
(2021)
Article
Spectroscopy
Qingsheng Xue, Nan Wang, Hui Yang, Jingyao Yang, Haoxuan Bai
Summary: In this study, a method combining Spatial heterodyne technology and Raman spectroscopy was proposed for rapid, efficient, and accurate detection of microplastics. By building a spatial heterodyne spectrometer and an optical system, detection and identification of different types of microplastic samples were achieved. The results showed a higher signal-to-noise ratio with this method, indicating its good performance and potential in the field of microplastics detection.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Xiangzhe Zhang, Jingping Zhu, Liqing Huang, Yu Zhang, Huimin Wang, Jinxin Deng, Fengqi Guo
Summary: The optical displacement calculation formula for the dual Wollaston prism is derived and validated. The relationship between the maximum incident aperture, incident angle, and incident surface angle is provided for different incident waves. The aperture utilization of a novel static birefringent Fourier transform imaging spectrometer based on dual Wollaston prisms is analyzed, considering the incident surface angle, incident angle, and prisms' air gap thickness.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
M. Capezzuto, D. D'Ambrosio, S. Avino, A. Giorgini, G. Gagliardi, P. Malara
Summary: In this study, a fast-scan optofluidic Fourier transform (FT) spectrometer on the tip of an optical fiber is demonstrated by stabilizing the evaporation dynamics of a microliter fluorocarbon droplet. Compared with other FT near-infrared (NIR) small-scale spectrometers reported in the literature, the fluorocarbon droplet spectrometer shows the largest wavelength span and span/resolution ratio, enabling easy spectral analysis of broadband or narrowband radiation. This opens up practical applications for droplet spectrometers as advanced optofluidic NIR analyzers with small size and low cost, capable of operating in harsh environments.
Article
Chemistry, Multidisciplinary
Yuqi Sun, Xiaotian Li, Jiri Galantu, Qihang Chu, Jun Chen, Fuguan Li, Nan Song, Geng Wang, Qiliang Ni
Summary: This paper presents the development of an echelle grating spatial heterodyne terahertz Raman spectrometer (E-SHTRS) that combines echelle gratings with spatial heterodyne terahertz Raman spectroscopy. The system achieves higher spectral resolution and a wider detection range compared to conventional spectrometers. Experimental results demonstrate the good detection performance and potential applications of the E-SHTRS in various fields.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
M. G. Burke, R. J. Fonck, J. M. Harlander, G. R. McKee
Summary: A broadening compensation method was developed for spatial heterodyne spectroscopy interferometric technique to reduce artificial broadening and enable high resolution measurements at a significantly higher photon flux. The compensated measurement of emission from deuterium neutrals in a tokamak plasma showed a spectral width of about 0.13 nm, 4 times smaller than the uncompensated width of 0.5 nm.
Article
Optics
Qinghua Yang
Summary: The UWA-2HSR-SIS is a novel imaging spectrometer that combines ultra-wide field angle, high spatial resolution, and high spectral resolution. It can capture spectral information in real time across the full spectral range of interest, while remaining stable against various disturbances. The system shows great potential for remote sensing electro-optical reconnaissance sensors.