Wavelength scaling of electron collision time in plasma for strong field laser-matter interactions in solids
Wavelength scaling of electron collision time in plasma for strong field laser-matter interactions in solids
复制标题
固体中强场激光-物质相互作用的等离子体中电子碰撞时间的波长缩放
DOI：
10.1038/s42005-021-00600-9
复制
发表时间：
2021
影响因子：
5.5
通讯作者：
Shim, Bonggu
中科院分区：
文献类型：
--
作者：
Nagar, Garima C.;Dempsey, Dennis;Shim, Bonggu
Although the dielectric constant of plasma depends on electron collision time as well as wavelength and plasma density, experimental studies on the electron collision time and its effects on laser-matter interactions are lacking. Here, we report an anomalous regime of laser-matter interactions generated by wavelength dependence (1.2–2.3 µm) of the electron collision time in plasma for laser filamentation in solids. Our experiments using time-resolved interferometry reveal that electron collision times are small (<1 femtosecond) and decrease as the driver wavelength increases, which creates a previously-unobserved regime of light defocusing in plasma: longer wavelengths have less plasma defocusing. This anomalous plasma defocusing is counterbalanced by light diffraction which is greater at longer wavelengths, resulting in almost constant plasma densities with wavelength. Our wavelength-scaled study suggests that both the plasma density and electron collision time should be systematically investigated for a better understanding of strong field laser-matter interactions in solids.
