Femtosecond dynamics on the nanoscale of intense laser-induced grating plasma

被引:1
|
作者
Dulat, Ankit [1 ]
Dam, Sagar [1 ]
Rakeeb, Sk [1 ]
Lad, Amit D. [1 ]
Ved, Yash M. [1 ]
Kumar, G. Ravindra [1 ]
机构
[1] Tata Inst Fundamental Res, Dr Homi Bhabha Rd, Mumbai 400005, India
基金
新加坡国家研究基金会; 英国工程与自然科学研究理事会;
关键词
HIGH-CONTRAST; SCALE LENGTH; ACCELERATION;
D O I
10.1063/5.0209106
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The complex interaction dynamics of intense femtosecond (fs) pulses and their picosecond (ps)-long leading edge with nanostructured solids occur at nanometer (nm) spatial and the fs temporal scales, making them extremely difficult to measure directly. Here, we present pump-probe-based measurements that capture the ultrafast evolution of relativistically intense laser-driven grating plasma on these scales. We measure the transient reflectivity and spectrum of the scattered or diffracted UV-probe pulses from the grating structures with hundreds of fs resolution. Our measurements capture the initial onset of the solid-to-plasma transition and the subsequent grating plasma expansion, a few ps before the peak of the intense fs pulse. We measure the instantaneous position of the electron critical surface, its velocity, and acceleration, which are very crucial for understanding the physics and applications in ion/electron acceleration and high harmonic generation, while also providing valuable benchmarks for simulations. Particle-in-cell simulations corroborate the observations offering further insight into this process.
引用
收藏
页数:6
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