Raman spectra measuring device for multi-wavelength laser frequency shift excitation

The invention relates to a Raman spectra measuring device for multi-wavelength laser frequency shift excitation. The Raman spectra measuring device comprises at least two semiconductor lasers used for generating lasers with fixed wavelengths, at least two laser control modules used for controlling parameters of the lasers, a fiber-optical switch used for switching light sources of the semiconductor lasers, a Raman probe used for carrying out focusing excitation on a sample to be detected and collecting Raman optical signals generated by the sample, a sample cell used for placing the sample to be detected, a grating splitting module used for dividing the Raman optical signals on space, a spectral data acquisition module used for carrying out photoelectric conversion on the Raman optical signals and an arithmetic processing module used for analyzing and extracting Raman spectra. The Raman spectra measuring device is capable of overcoming the disadvantages of the common tunable laser of instability, complex device or the like, effectively inhibiting fluorescence interference and realizing Raman spectra detection under strong fluorescence background.