文章建立了光纤激光频谱组束的体光栅参数优化模型。研究结果表明，随着体光栅空间频率和折射率调制量的增大，体光栅所允许的光束谱宽减小，光束发散角增大，得到空间频率和折射率调制量优化选择参数。文章还对所选取的体光栅参数进行频谱组束的效率进行了分析。研究表明，采用优化参数的体光栅的频谱组束效率可提高至95%以上。

In this paper, we propose a volume grating parameter-optimized model for fiber laser spectral combining. Simulation results show that with the increase of the spatial frequency and refractive index modulation of the volume grating, the spectral width of the beam that it allows decreases and the beam divergence increases. On the basis of the proposed model, we optimize the spatial frequency and refractive index modulation and calculate and analyze the combining efficiency by using the optimized grating parameters. Our calculation shows that the efficiency is raised to over 95%.