Burger M, Skrodzki P J, Lin J, Nees J, Krushelnick K, Jovanovic I
Opt Express. 2018 Jun 25;26(13):16456-16465. doi: 10.1364/OE.26.016456.
Studies of high-power ultrashort laser pulse interaction with matter are not only of fundamental scientific interest, but are also highly relevant to applications in the domain of remote sensing. Here, we investigate the effect of laser wavelength on coupling of femtosecond laser filaments to solid targets. Three central wavelengths have been used to produce filaments: 0.4, 0.8, and 2.0 µm. We find that, unlike the case of conventional tight focusing, use of shorter wavelengths does not necessarily produce more efficient ablation. This is explained by increased multi-photon absorption arising in near-UV filamentation. Investigations of filament-induced plasma dynamics and its thermodynamic parameters provide the foundation for unveiling the interplay between wavelength-dependent filament ablation mechanisms. In this way, strategies to increase the sensitivity of material detection via this technique may be better understood, thereby improving the analytical performance in this class of applications.
高功率超短激光脉冲与物质相互作用的研究不仅具有重要的基础科学意义，而且与遥感领域的应用也高度相关。在此，我们研究了激光波长对飞秒激光细丝与固体靶耦合的影响。已使用三个中心波长来产生细丝：0.4、0.8和2.0微米。我们发现，与传统紧密聚焦的情况不同，使用较短波长不一定会产生更高效的烧蚀。这可以通过近紫外细丝化中多光子吸收的增加来解释。对细丝诱导的等离子体动力学及其热力学参数的研究为揭示波长依赖的细丝烧蚀机制之间的相互作用提供了基础。通过这种方式，可以更好地理解通过该技术提高材料检测灵敏度的策略，从而改善这类应用中的分析性能。
