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采用折射率调制特性为上凸型和下凹型的调制曲线,提出了线性化求解非线性记录全息图耦合波方程的方法。以反射相位型全息光栅为例,用耦合波理论分析计算了记录介质折射率调制为上凸型和下凹型调制曲线的体全息图的衍射光谱特性。计算结果表明,折射率调制类型对光栅衍射光谱的带宽有较大影响,对次峰峰值也有影响,而对主峰峰值和峰值位置影响不大。这些结果可以解释实验测得的全息光栅衍射光谱带宽较宽和光栅衍射光谱的多样性。
Using the modulation curves of refractive index modulation as convex and concave modulation, a method of linearization to solve the nonlinear recorded hologram coupled wave equation is proposed. Taking the reflection phase holographic gratings as an example, the diffraction spectrum characteristics of the volume hologram with the modulation of the refractive index of the recording medium to the convex and concave modulation curves are calculated by the coupled wave theory. The calculated results show that the type of refractive index modulation has a great influence on the bandwidth of grating diffraction spectrum, but also affects the sub-peak, but has little effect on the main peak and the peak position. These results can explain the wide bandwidth of the diffraction spectrum and the diversity of grating diffraction spectrum measured by the experiment.