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Generation of low-order Laguerre-Gaussian beams using hybrid-machined reflective spiral phase plates for intense laser-plasma interactions
Results in Physics ( IF 5.3 ) Pub Date : 2020-10-16 , DOI: 10.1016/j.rinp.2020.103499
Ji Yong Bae , Cheonha Jeon , Ki Hong Pae , Chul Min Kim , Hong Seung Kim , Ilkyu Han , Woo-Jong Yeo , Byeongjoon Jeong , Minwoo Jeon , Dong-Ho Lee , Dong Uk Kim , Sangwon Hyun , Hwan Hur , Kye-Sung Lee , Geon Hee Kim , Ki Soo Chang , Il Woo Choi , Chang Hee Nam , I Jong Kim

In laser-plasma interactions (LPI), the laser beam mode is a critical parameter when trying to explore new physical phenomena. Of the various spatial beam modes, the Laguerre-Gaussian (LG) mode with vortex phase has attracted considerable attention due to its unique features, including the ability to carry an orbital angular momentum. Due to this, it has been actively applied to LPI, which mainly utilize ultrashort intense laser pulses. However, existing transmissive phase-manipulating optical elements have several limitations when applied in LPI due to critical issues such as pulse broadening, attenuation, and beam shape–all of which have an influence on the beam quality, as well as, geometry, size, simplicity, and cost–all of which are related to processing technologies. In this paper, we present a series of procedures to obtain high-quality low-order (l = 1 and 2) LG vortex beams from large-sized off-axis reflective spiral phase plates (ORSPPs). The geometric designs for various surface structures, electromagnetic wave simulations in the extra-large domain, hybrid-mechanical processing technique attempted newly, and experimental demonstrations are involved. Experimental observations of LG intensity distributions and interference fringes were verified with the simulation results of Poynting vector, phase, and angular momentum densities. The beam quality of LG intensity distributions was analyzed quantitatively through the investigation of an annular zone formed from the uniformity of the stepped and continuous surface structures of ORSPPs. Furthermore, we numerically investigated the physical phenomena on the high-intensity angular momentum transfer from light to matter, considering ORSPP–driven low-order LG vortex laser pulses, by performing 3D particle-in-cell simulations.



中文翻译:

利用混合加工的反射螺旋相位板产生低阶拉盖尔-高斯光束,以实现强烈的激光-等离子体相互作用

在激光等离子体相互作用(LPI)中,当尝试探索新的物理现象时,激光束模式是一个关键参数。在各种空间光束模式中,具有涡旋相位的拉盖尔-高斯(LG)模式由于其独特的功能(包括携带轨道角动量的能力)而受到了广泛的关注。因此,它已被积极地应用于主要利用超短强激光脉冲的LPI。但是,由于存在诸如脉冲展宽,衰减和光束形状等关键问题,因此在LPI中应用时,现有的透射式相位控制光学元件存在一些局限性,所有这些因素都会影响光束质量以及几何形状,尺寸,简单性和成本–所有这些都与处理技术有关。在本文中, = 1和2)来自大型离轴反射螺旋相位板(ORSPP)的LG涡旋光束。涉及各种表面结构的几何设计,超大范围的电磁波仿真,新尝试的混合机械加工技术以及实验演示。用Poynting矢量,相位和角动量密度的仿真结果验证了LG强度分布和干涉条纹的实验观察结果。通过研究由ORSPP的阶梯状和连续表面结构的均匀性形成的环形区域,定量分析了LG强度分布的光束质量。此外,我们通过数值研究了从光到物质的高强度角动量转移的物理现象,

更新日期:2020-10-30
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