Examining second-harmonic generation of high-order Laguerre-Gaussian modes through a single cylindrical lens.
Examining second-harmonic generation of high-order Laguerre-Gaussian modes through a single cylindrical lens.
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DOI：
10.1364/ol.42.004387
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发表时间：
2017-11
期刊：
影响因子：
3.6
通讯作者：
Xinyuan Fang;Zeyu Kuang;Peng Chen;Haocheng Yang;Qian Li;Wei Hu;Yan-qing Lu;Yong Zhang;
中科院分区：
文献类型：
--
作者：
Xinyuan Fang;Zeyu Kuang;Peng Chen;Haocheng Yang;Qian Li;Wei Hu;Yan-qing Lu;Yong Zhang;
实验研究了准相位匹配(QPM)配置下高阶拉盖尔-高斯(LG)模的二次谐波产生。首先，我们介绍了一种观察高阶LG模的方位(L)和径向(P)指数的简单方法。基于像散变换技术，L和p被揭示在焦面上转换的图案的暗条纹的数目。然后，利用这种有效的测量方法，我们在实验中证明了周期极化KTP晶体中的二次谐波LG模，其径向和方位向折射率是通过QPM输入基波的两倍。我们的结果为同时获得具有较大径向和方位指数的LG模提供了一种可行的方法。
We experimentally investigate the second-harmonic generation of a high-order Laguerre-Gaussian (LG) mode under the quasi-phase-matching (QPM) configuration. First, we introduce a simple method to observe the azimuthal (l) and radial (p) indices of the high-order LG modes. Based on the astigmatic transformation technique, l and p are revealed in the number of dark stripes of the converted pattern in the focal plane. Then, using this efficient method of measurement, we demonstrate in experiments a second-harmonic LG mode with its radial and azimuthal indices being twice those of the inputted fundamental wave through QPM in a periodically poled KTP crystal. Our results provide a feasible way to obtain simultaneously the LG modes with larger radial and azimuthal indices.