Junjuri Rajendhar, Nalam Samuel Anurag, Manikanta E, Harsha S Sree, Kiran P Prem, Gundawar Manoj Kumar
Opt Express. 2021 Mar 29;29(7):10395-10405. doi: 10.1364/OE.417842.
We present the spatial and temporal characterization of the copper (Cu) plasma produced by the femtosecond laser filaments. The filaments of various lengths and intensities were generated with the aid of three different focusing lenses. Further, the filamentation induced breakdown spectroscopy (FIBS) measurements were carried out for each filament at three different positions along the length of the filament. The filaments were spatially characterized by estimating the plasma temperature and electron density. Our investigation has demonstrated that the centre of the filament is the best to obtain a maximum signal. Both the spectral line intensity and their persistence time are highest for the center of the filament. The enhanced persistence and the scalability of the spectral line intensity tested across different focusing geometries can boost the application of this technique in various fields.
我们展示了飞秒激光丝产生的铜（Cu）等离子体的空间和时间特性。借助三个不同的聚焦透镜产生了各种长度和强度的激光丝。此外，对每根激光丝沿其长度方向的三个不同位置进行了丝状诱导击穿光谱（FIBS）测量。通过估计等离子体温度和电子密度对激光丝进行空间表征。我们的研究表明，激光丝的中心最适合获得最大信号。激光丝中心的谱线强度及其持续时间都是最高的。在不同聚焦几何结构上测试的谱线强度的增强持续性和可扩展性可以推动该技术在各个领域的应用。
