基于波动方程,采用光束传输法,研究了sinc切趾体布拉格光栅的衍射特性,并验证了该方法的有效性。分析了因温度升高引起的背景折射率的变化对sinc切趾体布拉格光栅衍射效率的影响,分析了由高功率导致的sinc切趾体光栅形变对高斯光束衍射后的光强分布的影响。结果表明:光束传输法可以精确求解sinc切趾体光栅的光谱衍射效率,还可以计算经sinc切趾体光栅衍射后的衍射光束的光强分布;随着背景折射率的增加,sinc切趾体光栅的谱选择窗口漂移会越来越大;随着sinc切趾体光栅形变的增大,光栅的衍射效率会明显减小,且光强分布畸变会越来越严重。这为sinc切趾体光栅在高功率激光中的应用提供了指导。 Based on the wave equation, the diffraction characteristics of sinc incise Bragg gratings are investigated by using the beam propagation method. The effectiveness of the proposed method is verified. The influence of the change of background refractive index on the diffraction efficiency of sinc incise Bragg gratings due to the temperature increase is analyzed. The influence of the sinc incise grating deformation caused by the high power on the light intensity distribution after Gaussian beam diffraction is analyzed. The results show that the beam transmission method can accurately calculate the spectral diffraction efficiency of the sinc incise grating and calculate the light intensity distribution of the diffracted beam after sinc incise grating diffraction. With the increase of the background refractive index, the sinc apodization The spectral selection window of the grating will drift more and more. With the increase of sinc apodization grating diffraction efficiency, the grating diffraction efficiency will be significantly reduced, and the light intensity distribution distortion will be more and more serious. This provides guidance for the use of sinc apodized gratings in high-power lasers.