体光栅光谱合成技术是获得高功率激光输出的一种有效途径，体光栅衍射旁瓣是影响合成光束数目的主要因素。采用了Hamming切趾技术对体光栅旁瓣进行抑制，建立了Hamming切趾体光栅的折射率分布模型，分析了Hamming切趾体光栅的衍射特性，给出了Hamming切趾体光栅光谱合成效率公式，分析了切趾光栅对光谱合成效率的影响。计算结果表明：体光栅切趾后有效减小了体光栅对相邻合成光束的衍射损耗，切趾后，在20 nm的带宽内，谱合成光束的数目由13束增加为20束，谱合成效率达75.3%，光谱合成功率提高为切趾前的1.5倍。

Spectral beam combining technology of volume Bragg grating is an effective approach to obtain high-power laser output. The side lobe of output spectrum of volume Bragg grating is the main factor which limits the number of spectral beam combining. In this paper, the side lobe of volume Bragg grating was suppressed using Hamming apodization. The theoretical model of the refractive index of the one-dimensional apodized Bragg grating was built, and the diffraction characteristic of the Hamming apodized Bragg grating was analyzed, and the combining efficiency equation of the Hamming apodized Bragg grating was provided. Then the effect of apodized grating on the combining efficiency was analyzed. Numerical analysis shows that the side lobe in diffraction efficiency is suppressed well by using the Hamming apodization. The number of beam in spectral beam combining is increased from 13 to 20 in a total 20 nm bandwidth, and the combining efficiency can reach 75.3% after using Hamming apodized grating, while the output power is 1.5 times of the not-apodized output power.