High Orbital Angular Momentum Harmonic Generation.
High Orbital Angular Momentum Harmonic Generation.
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DOI：
10.1103/physrevlett.117.265001
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发表时间：
2016-11
影响因子：
8.6
通讯作者：
J. Vieira;R. Trines;E. Alves;R. Fonseca;J. T. Mendonça;R. Bingham;P. Norreys;L. Silva
中科院分区：
文献类型：
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作者：
J. Vieira;R. Trines;E. Alves;R. Fonseca;J. T. Mendonça;R. Bingham;P. Norreys;L. Silva
我们识别和探索了一种高轨道角动量(OAM)谐波的产生和放大机制，该机制通过在等离子体中受激拉曼背散射来保持初始激光波长，独立于任何其他激光性质来操纵OAM。高的OAM谐波谱至少可以扩展到近轴近似施加的极限值。理论和粒子模拟表明，OAM谐波的阶数可以根据依赖于相互作用波的初始OAM的选择规则来调节。我们用几个例子说明了等离子体中高OAM谐波的产生，包括产生主要的OAM谐波。这一过程也可以在任何支持三波相互作用的非线性光学克尔介质中实现。
We identify and explore a high orbital angular momentum (OAM) harmonics generation and amplification mechanism that manipulates the OAM independently of any other laser property, by preserving the initial laser wavelength, through stimulated Raman backscattering in a plasma. The high OAM harmonics spectra can extend at least up to the limiting value imposed by the paraxial approximation. We show with theory and particle-in-cell simulations that the orders of the OAM harmonics can be tuned according to a selection rule that depends on the initial OAM of the interacting waves. We illustrate the high OAM harmonics generation in a plasma using several examples including the generation of prime OAM harmonics. The process can also be realized in any nonlinear optical Kerr media supporting three-wave interactions.