【摘要】：正 The Raman mixing (RM) as a principal factor affecting the relative intensities of multi-order stimulated Raman scattering (SRS) in an optical fiber is investigated theoretically. Theprocesses of RM and high-order SRS have been considered, and a set of combined differentialequations including nine waves have been presented and the numerical solutions up to ten-order SRS have been done. By using a YAG: Nd Q-spoiled laser, a pulsed dye laser and amultimode vitreous GeO_2·SiO_2 optical fiber, the relative intensities of multi-order SRS excitedby the single- and two-wavelength light have been observed. The theoretical results are inagreement with experimental ones. The SRS spectra observed experimentally are considereddue to the simultaneous existence of two sorts of scattering elements corresponding to thedeformation vibration of SiO_2 and GeO_2 tetrahedra with frequencies of 1.3 × 10~(13) and 1.4 ×10~(13)Hz.