High order modes of intense second harmonic light produced from a plasma aperture
High order modes of intense second harmonic light produced from a plasma aperture
复制标题
DOI：
10.1063/5.0097585
复制
发表时间：
2022-09
影响因子：
5.1
通讯作者：
E. F. J. Bacon;M. King;R. Wilson;T. P. Frazer;R. Gray;P. McKenna
中科院分区：
文献类型：
--
作者：
E. F. J. Bacon;M. King;R. Wilson;T. P. Frazer;R. Gray;P. McKenna
由于等离子体光学元件能够维持极高振幅的电磁场和瞬态密度和场分布，因此正在开发等离子体光学元件以放大、压缩和调节高功率激光脉冲。我们最近证明了使用相对论等离子体孔径的潜力-在高功率激光脉冲与铝箔靶相互作用期间产生-以定制所产生的强烈基波和二次谐波光的时空特性[Duff等人，Sci. Rep. 10，105（2020）]。在这里，我们探讨了数值模拟的强激光脉冲与预制孔径目标的相互作用，以产生具有高阶空间模式的二次谐波激光。对于接近激光焦点半峰全宽的孔径直径和微米级目标厚度，发现最大生成效率。所产生的空间模式强烈依赖于驱动激光脉冲的偏振，这使得线偏振的TEM 01模式和圆偏振的拉盖尔-高斯LG 01模式之间的变化。这证明了使用等离子体孔径来产生具有可选择的空间模式结构的强高频光。
Because of their ability to sustain extremely high-amplitude electromagnetic fields and transient density and field profiles, plasma optical components are being developed to amplify, compress, and condition high-power laser pulses. We recently demonstrated the potential to use a relativistic plasma aperture—produced during the interaction of a high-power laser pulse with an ultrathin foil target—to tailor the spatiotemporal properties of the intense fundamental and second-harmonic light generated [Duff et al., Sci. Rep. 10, 105 (2020)]. Herein, we explore numerically the interaction of an intense laser pulse with a preformed aperture target to generate second-harmonic laser light with higher-order spatial modes. The maximum generation efficiency is found for an aperture diameter close to the full width at half maximum of the laser focus and for a micrometer-scale target thickness. The spatial mode generated is shown to depend strongly on the polarization of the drive laser pulse, which enables changing between a linearly polarized TEM01 mode and a circularly polarized Laguerre–Gaussian LG01 mode. This demonstrates the use of a plasma aperture to generate intense higher-frequency light with selectable spatial mode structure.