National Laboratory of Solid State Microstructures, School of Physics, School of Engineering and Applied Science, Nanjing University, Nanjing, China.
Opt Lett. 2012 Feb 15;37(4):689-91. doi: 10.1364/OL.37.000689.
We demonstrate the fractional second-harmonic (SH) Talbot effect in a hexagonally poled LiTaO3 crystal. We carefully record the SH Talbot images at 1/2, 1/3, and 1/4 Talbot lengths, which are well matched with the simulated images by using the modified Rayleigh-Sommerfeld diffraction formula. A simplified model with a hexagonal array is adopted in the simulations. Also, we use a modified reciprocal vector theory to analytically explain the evolution of the SH array at fractional Talbot lengths. Our results show that the images are sensitive to the duty circle and the background of the array.
我们在六边形极化的 LiTaO3 晶体中展示了分数次谐波（SH）塔尔博特效应。我们仔细记录了在 1/2、1/3 和 1/4 塔尔博特长度处的 SH 塔尔博特图像，这些图像与使用改进的瑞利-索末菲衍射公式的模拟图像非常匹配。在模拟中采用了六边形阵列的简化模型。此外，我们还使用改进的倒易矢量理论来分析解释分数塔尔博特长度处 SH 阵列的演化。我们的结果表明，图像对占空比和阵列的背景敏感。
