Commissariat à l'Energie Atomique, Lasers, Interactions and Dynamics Laboratory, DSM/IRAMIS, CEN Saclay, 91191 Gif sur Yvette, France.
Commissariat à l'Energie Atomique, DAM, DIF 91297 Arpajon Cedex, France.
Phys Rev Lett. 2014 Apr 11;112(14):145008. doi: 10.1103/PhysRevLett.112.145008.
A general approach for optically controlled spatial structuring of overdense plasmas generated at the surface of initially plain solid targets is presented. We demonstrate it experimentally by creating sinusoidal plasma gratings of adjustable spatial periodicity and depth, and study the interaction of these transient structures with an ultraintense laser pulse to establish their usability at relativistically high intensities. We then show how these gratings can be used as a "spatial ruler" to determine the source size of the high-order harmonic beams produced at the surface of an overdense plasma. These results open new directions both for the metrology of laser-plasma interactions and the emerging field of ultrahigh intensity plasmonics.
提出了一种在初始平滑固体靶表面产生的过密等离子体的光控空间结构化的通用方法。我们通过创建具有可调空间周期性和深度的正弦形等离子体光栅来实验证明这一点，并研究这些瞬态结构与超强激光脉冲的相互作用，以确定它们在相对论高强度下的可用性。然后，我们展示了这些光栅如何可用作“空间标尺”来确定过密等离子体表面产生的高阶谐波光束的源尺寸。这些结果为激光-等离子体相互作用的计量学以及新兴的超高强度等离子体学领域开辟了新的方向。
