Second-harmonic generation and the conservation of orbital angular momentum with high-order Laguerre-Gaussian modes
Second-harmonic generation and the conservation of orbital angular momentum with high-order Laguerre-Gaussian modes
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DOI：
10.1103/physreva.56.4193
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发表时间：
1997-11-01
影响因子：
2.9
通讯作者：
Padgett, MJ
中科院分区：
文献类型：
--
作者：
Courtial, J;Dholakia, K;Padgett, MJ
各种阶数的拉盖尔 - 高斯模式实现了倍频。通过让光束与其镜像干涉，直接测量了二次谐波光的方位角相位结构。我们表明每个光子的轨道角动量加倍，从而保持了光束中的轨道角动量。倍频输出光束在束腰处呈现出盖根堡尔 - 高斯振幅分布。该光束可描述为拉盖尔 - 高斯模式的叠加，这些模式相互干涉，使其随传播而改变形状，但束腰处的分布在远场中重现。[S1050 - 2947(97)03311 - 8]
Laguerre-Gaussian modes of various order are frequency doubled. The azimuthal phase structure of the second-harmonic light is measured directly by interfering the beam with its mirror image. We show that the orbital angular momentum per photon is doubled, so conserving the orbital angular momentum in the light beam. The frequency-doubled output beam is shown to have a Gegenbauer-Gaussian amplitude distribution at the beam waist. The beam can be described as a summation of Laguerre-Gaussian modes that interfere so that it changes form with propagation, but the distribution at the beam waist is reproduced in the far field. [S1050-2947(97)03311-8].