高通量Sagnac傅里叶变换拉曼光谱成像技术研究

Research on High Throughput Sagnac Fourier Transform Raman Imaging Spectrometry

拉曼高光谱成像能够有效获取待测目标的分子光谱-图像数据立方体,为提高微弱的自发拉曼散射信号的获取能力,开展高通量Sagnac傅里叶变换拉曼光谱成像技术研究。系统摒弃了传统的狭缝设计,具有类似于成像相机的光通量,可更加有效地获取微弱的自发拉曼散射信号。此外,采用Sagnac横向剪切干涉仪,具有偏振不敏感性和极小的色散效应,这使得系统在通过傅里叶变换复原光谱时具有良好的性能。搭建了实验系统,用于Er∶YAG和Nd∶YAG陶瓷的特性测试,其拉曼特征峰在散射光谱中清晰可辨。

Raman hyperspectral imaging is an effective method for acquiring molecular spectral-image data cubes of the target being studied.To enhance the detection of weak spontaneous Raman scattering signals,a high-throughput Sagnac Fourier-transform Raman spectroscopic imaging technique is explored.This system does not use the traditional slit design and has a light throughput similar to imaging cameras,enabling a more efficient capture of faint spontaneous Raman scattering signals.Moreover,the utilization of the Sagnac lateral shearing interferometer exhibits polarization insensitivity and minimal dispersion effects,resulting in superior performance in spectral reconstruction via Fourier transformation.An experimental setup is built to evaluate the properties of Er:YAG and Nd:YAG ceramic materials.It clearly identifies their Raman characteristic peaks in the scattered spectra and produced sharp imaging outcomes.