紫外-可见光双通道拉曼光谱仪光学设计

紫外拉曼光谱技术具有高强度拉曼散射、无荧光干扰的特点；可见光拉曼光谱技术可实现低波数、高分辨率探测。为兼具两种激发波长的优势，设计了一款对称分布的双Czerny-Turner光路聚焦于一个探测器的双通道拉曼光谱仪。通过元器件的选型和初始结构的计算，在不增加多余元器件的情况下，对弧矢方向像散进行补偿，避免了像面上的能量损失。配合Zemax软件对双通道光谱分别进行建模优化，最终实现了对400~5000 cm^-1（266 nm激发）和50~3500 cm^-1（633 nm激发）两段光谱的同时探测。均方根半径、点列图和调制传递函数等评价指标有效验证了设计的合理性和可行性。结果表明，两套拉曼光谱仪分别可达8 cm^-1和5 cm^-1分辨率，本设计具有高分辨率、低波数、多波长激发、集成化等优势。

Optical design of UV-visible dual-channel Raman spectrometer

UV Raman spectroscopy has the characteristics of high intensity Raman scattering and no fluorescence interference; visible Raman spectroscopy has the advantages of low wave number and high resolution detection. In order to combine the advantages of two excitation wavelengths, two symmetrically distributed Czerny-Turner optical paths focusing on one detector are designed for a dual-channel Raman spectrometer. Through the selection of components and calculation of the initial structure, the energy loss on the image plane can be avoided by compensating for the astigmatism in the arc-vector direction without adding extra components. Using the software Zemax, the dual-channel spectra were modeled and optimized separately, and the simultaneous detection of the spectra of 400~5000 cm^-1 (266 nm excitation) and 50~3500 cm^-1 (633 nm excitation) was finally realized. The rationality and feasibility of the design were verified by the root mean square radius, spot diagram, and modulation transfer function. The results show that the resolution of the two sets of spectrometers can reach 8 cm^-1 and 5 cm^-1, respectively. The design has the advantages of high resolution, low wave number, multi-wavelength excitation, and integration.