Mr. Siliang Li Profile

Siliang Li

at Anhui Institute of Optics and Fine Mechanics CAS

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SPIE Journal Paper | 5 February 2024

Design and evaluation of spatial heterodyne Raman spectrometer at 785 nm excitation wavelength

Yunfei Bai, Haiyan Luo, Zhiwei Li, Yi Ding, Siliang Li, Wei Xiong

OE, Vol. 63, Issue 02, 024103, (February 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.2.024103

KEYWORDS: Raman spectroscopy, Spectroscopy, Design, Heterodyning, Spectral resolution, Fluorescence, Interferograms, Signal to noise ratio, Modulation, Interferometers

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Raman spectroscopy has emerged as an essential technique for material composition analysis due to its noncontact, nondestructive, and rapid characteristics. Spatial heterodyne spectroscopy offers the advantages of high stability, high throughput, and ultra-high spectral resolution, making it particularly suitable for Raman spectroscopic detection. The main design parameters of a spatial heterodyne Raman detection system were determined under near-infrared wavelength excitation: a Raman shift detection range of 300 to 2000 cm−1 and a spectral resolution of 5 cm−1 at an excitation wavelength of 785 nm. The optical design of the dispersion module and imaging module was completed. Test results demonstrate that the spectrometer achieves a spectral resolution of 5.33 cm−1 and can detect Raman shifts in the range of 315 to 2131.6 cm−1. Verification tests on cyclohexane and lipstick samples confirm that the system exhibits excellent fluorescence suppression capability, with a signal-to-noise ratio of the cyclohexane Raman peak reaching 1600.8.

Proceedings Article | 12 March 2021 Paper

Mid-wave infrared spatial heterodyne interference imaging spectrometer

Siliang Li, Yi Ding, Zhiwei Li, Hailiang Shi, Wei Xiong, Haiyan Luo

Proceedings Volume 11763, 117632C (2021) https://doi.org/10.1117/12.2586385

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Aiming at the spaceborne detection application of mid-wave infrared interference imaging spectrometer, a temporally and spatially modulated interference imaging spectrometer detection scheme based on spatial heterodyne spectroscopy is presented. With the motion of the satellite platform or push-sweep mechanism, the interference modulation signals of different optical path in the same spatial resolution unit are obtained in time-sharing. After interference data reconstruction and spectral restoration, the spectral signals in each spatial resolution unit are finally obtained. The spectrometer consists of a pre-collimating objective unit, a static interferometer unit, an imaging unit and a focal plane unit, which can obtain three-dimensional data cubes of images and spectra at the same time. The spectrometer has the characteristics of large luminous flux, stable structure, miniaturization and so on. Under the requirement that the mid-wave infrared band is 3.7~4.8μm and the spectral resolution is better than that of 3cm^-1, taking the characteristic spectrum detection of spaceborne mid-wave infrared typical targets is carried out with F#4 focal plane module as an example, the design process and results of the optical system are given. The results show that the design of the optical system meets the requirements of the detection index, which lays a foundation for the remote sensing application of spaceborne high-resolution mid-wave infrared interference imaging spectroscopy.

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