Spatial shaping of low-and high-order harmonics generated using vortex beams

Journal of Physics D: Applied Physics Pub Date : 2024-04-25 DOI:10.1088/1361-6463/ad4371

Naresh kumar Reddy Andra, V. V. Kim, Victor Kӓrcher, Helmut Zacharias, A. Bundulis, A. Sarakovskis, A. Atvars, A. Ubelis, R. A. Ganeev

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Abstract

We demonstrate the generation of the low- and high-order harmonic vortex beams from a single spiral phase plate (SPP) illuminated by different laser wavelengths. The second harmonic (532 nm) originates from the application of the wavefront-structured 1064 nm femtosecond pulses with fractional orbital angular momentum during propagation through a lithium triborate crystal, while the third harmonic (500 nm) originates from the application of the wavefront-structured near-IR (1500 nm) femtosecond pulses with integer orbital angular momentum during propagation through a 150 µm thick fused silica plate. The topological charges of the second and third harmonics are measured and compared. The increase in topological charge and the peculiarities in orbital angular momentum variations during modification of the polarisation of the incident radiation are analyzed and discussed. The two-color-pump-driven second-harmonic vortex radiation interacted with an Ar gas jet to generate vortex harmonics up to the 14th order with double-lobe complex spatial profiles in the extreme ultraviolet region.

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利用涡流束产生的高低阶谐波的空间整形

我们展示了在不同波长激光照射下，单个螺旋相板（SPP）产生的低阶和高阶谐波涡流束。第二次谐波（532 nm）源于波前结构的 1064 nm 飞秒脉冲在通过三硼酸锂晶体传播时产生的分数轨道角动量，而第三次谐波（500 nm）源于波前结构的近红外（1500 nm）飞秒脉冲在通过 150 µm 厚的熔融石英板传播时产生的整数轨道角动量。测量并比较了二次谐波和三次谐波的拓扑电荷。分析和讨论了入射辐射偏振改变过程中拓扑电荷的增加和轨道角动量变化的特殊性。双色泵驱动的二次谐波涡旋辐射与氩气射流相互作用，在极紫外区产生了高达 14 阶的涡旋谐波，并具有双叶复杂空间轮廓。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Physics D: Applied Physics

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