在光栅记录介质色散效应的影响下,拓展Kogelnik的耦合波理论研究了反射型体全息光栅对偏振方向垂直和平行于入射面的超短脉冲激光光束衍射的性质。结果表明对于记录在LiNbO3光折变晶体中的体全息光栅,在色散效应、光栅参量和入射条件的共同影响下,光栅对偏振方向垂直于入射面的超短脉冲激光光束衍射的光谱带宽大于对偏振方向平行于入射面的超短脉冲激光光束衍射的光谱带宽,在不考虑光栅介质色散效应的影响时,它们都变大。进一步给出了衍射光的光谱带宽及光栅的衍射效率随入射脉冲的光谱带宽与光栅的光谱带宽比值的变化情况。

Considering the dispersion effect of the grating media, the coupled wave theory of Kogelnik is developed to study the diffraction properties of an ultra-short pulsed laser beam with different polarizated states, vertical or parallel to the incident plane by a reflection volume holographic grating. A special case of grating which is recorded in anisotropic photorefractive LiNbO3 crystals is given. It is investigated that the spectral bandwidth of the grating for the ultra-short pulsed laser beam with perpendicularly polarizated state is larger than that with parallel polarizated state, and both of them are reduced by the dispersion effect of the grating media. The spectral bandwidth variation of the diffraction light, and the diffraction efficiency variation of the volume holographic grating are studied with the spectral width ratio of the incident pulse and the grating.