Qiu Jun, Qi Xiangdong, Li Xiaotian, Tang Yuguo, Lantu Jiriga, Mi Xiaotao, Bayan Heshig
Opt Express. 2018 Oct 1;26(20):26106-26119. doi: 10.1364/OE.26.026106.
A field-widened spatial heterodyne Raman spectrometer with a mosaic grating structure is developed for the simultaneous sensitivity enhancement and broadband transmission Raman measurements. We optimize the etendue to maximize the signals collected from the samples by using field-widening prisms and employ two mosaic gratings to achieve broadband operation, covering 5638 cm with 2.865 cm spectral resolution. The signal-to-noise ratios are improved by a factor of more than 11 and show a good stability and fair repeatability. We investigate the effects of the sample thickness and outer layer depth and observe liquids, solids, mixed targets, and anti-Stokes shifts. The instrument exhibits good performance for wide-field, high-resolution broadband transmission Raman measurements.
研制了一种具有镶嵌光栅结构的扩场空间外差拉曼光谱仪，用于同时提高灵敏度和进行宽带透射拉曼测量。我们通过使用扩场棱镜优化光学扩展量，以最大化从样品收集的信号，并采用两个镶嵌光栅实现宽带操作，光谱分辨率为2.865 cm，覆盖范围为5638 cm。信噪比提高了11倍以上，具有良好的稳定性和相当的重复性。我们研究了样品厚度和外层深度的影响，并观察了液体、固体、混合目标和反斯托克斯频移。该仪器在宽场、高分辨率宽带透射拉曼测量中表现出良好的性能。
