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Tailoring OAM spectrum of high-order harmonic generation driven by two mixed Laguerre–Gaussian beams with nonzero radial nodes
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作者 汪倍羽 韩嘉鑫 金成 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第12期80-89,共10页
The extreme ultraviolet(XUV)light beam carrying orbital angular momentum(OAM)can be produced via high-order harmonic generation(HHG)due to the interaction of an intense vortex infrared laser and a gas medium.Here we s... The extreme ultraviolet(XUV)light beam carrying orbital angular momentum(OAM)can be produced via high-order harmonic generation(HHG)due to the interaction of an intense vortex infrared laser and a gas medium.Here we show that the OAM spectrum of vortex HHG can be readily tailored by varying the radial node(from 0 to 2)in the driving laser consisting of two mixed Laguerre-Gaussian(LG)beams.We find that due to the change in spatial profile of HHG,the distribution range of the OAM spectrum can be broadened and its shape can be modified by increasing the radial node.We also show that the OAM mode range becomes much wider and its distribution shape becomes more symmetric when the harmonic order is increased from the plateau to the cutoff when the driving laser has the nonzero radial nodes.Through the map of coherence length and the evolution of harmonic field in the medium,we reveal that the favorable off-axis phase-matching conditions are greatly modified due to the change of intensity and phase distributions of driving laser with the radial node.We anticipate this work to stimulate some interests in generating the XUV vortex beam with tunable OAM spectrum through the gaseous HHG process achieved by manipulating the mode properties of the driving laser beam. 展开更多
关键词 orbital angular momentum(OAM)spectrum high-order harmonic generation Laguerre–Gaussian beam radial nodes PHASE-MATCHING
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Calibration of quantitative rescattering model for simulating vortex high-order harmonic generation driven by Laguerre–Gaussian beam with nonzero orbital angular momentum
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作者 韩嘉鑫 管仲 +1 位作者 汪倍羽 金成 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第12期98-107,共10页
We calibrate the macroscopic vortex high-order harmonic generation(HHG)obtained by the quantitative rescattering(QRS)model to compute single-atom induced dipoles against that by solving the time-dependent Schr?dinger ... We calibrate the macroscopic vortex high-order harmonic generation(HHG)obtained by the quantitative rescattering(QRS)model to compute single-atom induced dipoles against that by solving the time-dependent Schr?dinger equation(TDSE).We show that the QRS perfectly agrees with the TDSE under the favorable phase-matching condition,and the QRS can accurately predict the main features in the spatial profiles of vortex HHG if the phase-matching condition is not good.We uncover that harmonic emissions from short and long trajectories are adjusted by the phase-matching condition through the time-frequency analysis and the QRS can simulate the vortex HHG accurately only when the interference between two trajectories is absent.This work confirms that it is an efficient way to employ the QRS model in the single-atom response for precisely simulating the macroscopic vortex HHG. 展开更多
关键词 high-order harmonic generation quantitative rescattering model time-dependent Schr?dinger equation macroscopic propagation orbital angular momentum Laguerre–Gaussian beam
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含有径向节点的拉盖尔-高斯光束产生涡旋高次谐波的特征
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作者 汪倍羽 韩嘉鑫 金成 《红外与激光工程》 EI CSCD 北大核心 2022年第2期423-432,共10页
利用红外超快涡旋激光脉冲与气体介质相互作用可以产生携带轨道角动量的极紫外高次谐波。采用含有径向节点的拉盖尔-高斯(LG)光束作为驱动光,利用定量重散射模型计算单原子响应,通过求解谐波场在介质中传播的三维麦克斯韦方程以及在傍... 利用红外超快涡旋激光脉冲与气体介质相互作用可以产生携带轨道角动量的极紫外高次谐波。采用含有径向节点的拉盖尔-高斯(LG)光束作为驱动光,利用定量重散射模型计算单原子响应,通过求解谐波场在介质中传播的三维麦克斯韦方程以及在傍轴近似下的惠更斯积分,分别获得近场和远场高次谐波的强度和相位分布。结果表明:随着驱动光的径向节点数增加,高次谐波的强度分布呈现多环结构,相位分布上出现节点结构,强度分布的空间范围在近场减小,而在远场增大。相位匹配分析显示,短轨道和长轨道高次谐波的空间相干长度分布图对驱动激光的模式非常敏感,与高次谐波场在气体介质内的演化图像定性一致,解释了有径向节点的LG光束作用下产生的涡旋高次谐波的特征。 展开更多
关键词 高次谐波 拉盖尔-高斯光束 径向节点 相位匹配 长短轨道
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