体全息光栅线性记录折射率分布的修正

在讨论非线性记录体全息光栅的光谱特性时,发现一些文献在线性记录时折射率分布的表达式有些不妥.重新讨论了线性记录情况下折射率分布的表达式,引入了光束比和总光强折射率调制系数,用耦合波理论计算讨论了不同光束比和总光强折射率调制系数对光栅衍射光谱特性的影响.计算结果表明,光栅衍射光谱主峰峰值随总光强调制系数的减小而略有降低,主峰峰值随光束比减小下降得不大,带宽随总光强调制系数和光束比的减小而明显变窄,次峰峰值随总光强调制系数和光束比的减小而明显减小.

Correction of Refractive Index Distribution in Volume Hologram Grating Recorded Linearly

Some wrong points are found about the formula of the refractive index distribution in volume hologram grating recorded linearly in some literatures when the nonlinear recording spectral properties of volume hologram are discussed. The formula of the refractive index distribution is discussed again when recorded linearly. The light intensity ratio and the total light intensity refractive index modulation coefficient are added into the formula, and the diffraction spectral of gratings versus different light intensity ratio and total light intensity refractive index modulation coefficient are calculated in the coupled-wave theory. The calculational results show that the primary peak values of diffraction spectrum reduce slightly when the light intensity refractive index modulation coefficient or the light intensity ratio decreases, but the secondary peak value, decreases obviously and the bandwidth becomes narrow greatly with those conditions.