Abstract:With the continuous development of laser, Raman spectroscopy detection technology based on laser sources has become an important method for identifying geological sample compositions because of its advantages such as fast, nondestructive and non-contact detection. The laser wavelength is one of the crucial determining factors for the Raman effect in samples. Therefore, further clarification of its impact on the detection of geological sample compositions can provide important references for planetary mineral composition research. In this study, based on a self-established 532nm/785nm dual-wavelength Raman spectroscopy detection system, the influence of different laser wavelengths on the spectroscopy of geological sample compositions was investigated. Characteristic Raman spectra of various geological sample major components, including nitrate, carbonate, phosphate, silicate, as well as sulfides and oxides, were obtained. A comparison indicates that 532nm laser, due to its higher photon energy, could detect more sample components, but has a stronger fluorescence effect. On the other hand, 785nm laser faces the issue of lower Raman intensity, but has a good fluorescence suppression effect. The choice of the optimal laser wavelength could be made based on the actual types of samples.