# Terahertz Raman Measurements Using a Spatial Heterodyne Raman Spectrometer
); [EMAIL_ADDRESS] (X.Y); [EMAIL_ADDRESS] (P.L)  
[PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,  
Changchun 130033, China; [EMAIL_ADDRESS] (Y.S); [EMAIL_ADDRESS] (J.G. ); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (Z.L. ); [EMAIL_ADDRESS] (X.M. ); [EMAIL_ADDRESS] (X.Y); [EMAIL_ADDRESS] (P.L)  
[PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,  
Changchun 130033, China; [EMAIL_ADDRESS] (Y.S); [EMAIL_ADDRESS] (J.G. ); [EMAIL_ADDRESS] (Q.C. ); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (Z.L. ); [EMAIL_ADDRESS] (X.M. ); [EMAIL_ADDRESS] (X.Y); [EMAIL_ADDRESS] (P.L)  
[PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,  
Changchun 130033, China; [EMAIL_ADDRESS] (Y.S); [EMAIL_ADDRESS] (J.G. ); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (Z.L. ); [EMAIL_ADDRESS] (X.M. ); [EMAIL_ADDRESS] (X.Y. ); [EMAIL_ADDRESS] (P.L)  
[PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,  
Changchun 130033, China; [EMAIL_ADDRESS] (Y.S); [EMAIL_ADDRESS] (J.G. ); [EMAIL_ADDRESS] (Q.C. ); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (Z.L. ); [EMAIL_ADDRESS] (X.M. ); [EMAIL_ADDRESS] (X.Y); [EMAIL_ADDRESS] (P.L)  
[PERSON]  
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences,  
Changchun 130033, China; [EMAIL_ADDRESS] (Y.S); [EMAIL_ADDRESS] (J.G. ); [EMAIL_ADDRESS] (Q.C. ); [EMAIL_ADDRESS] (J.C.); liuzhongkai20@mails.ucas.ac.cnsignal and attenuating the intensity of Rayleigh scattering are the key points of instrument design. [PERSON] et al. used three cascading monochromators to detect THz Raman spectra [16]. However, the throughput of this method is low and the structure is complex. With further technological development, THz Raman detection systems now use Bragg notch filters (BNFs) to filter low-wavenumber signals. [PERSON] et al. [17] and [PERSON] et al. [18] have used a combination of BNFs and a dispersive Raman spectrometer to realize THz Raman measurement. However, the incidence slit of a dispersive Raman spectrometer reduces the throughput and the SNR. In this paper, we propose a THz detection system using a spatial heterodyne Raman spectrometer structure that has no incident slit, no moving parts, high throughput, good stability, and strong anti-interference ability. We used 532 nm green laser as the light source. In addition, the zero-space frequency of spatial heterodyne Raman spectrometer is not zero, and the detector pixel stores the information of each measured wavelength, which improves the spectral resolution. The system uses BNFs to filter THz Raman signals. The throughput is increased by combining prisms and gratings to widen the field of view. THz Raman spectra were measured for sulfur, organic acids, nucleobases, and other solid samples. The SNR was calculated for sulfur with different integration times and laser powers. The spectra of samples in different containers were measured and analyzed. The same laser power and integration time were used at different times to measure the same sample to verify the stability and repeatability of the system. The aqueous solutions were measured under different concentrations. In addition, measurements were done for solid and liquid mixtures.