Wavelength Scaling of Plasma and Spatio-Temporal Dynamics of Laser Filamentation in Solids

等离子体的波长缩放和固体中激光丝的时空动力学

• 批准号: 1707237
• 负责人: Bonggu Shim
• 金额: $ 32.5万
• 依托单位: SUNY at Binghamton
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707237&HistoricalAwards=false
• 关键词: Wavelength; Scaling; Plasma; Spatio; Temporal

This research project will improve the understanding of the physical mechanisms and the spatio-temporal dynamics of laser filamentation in solids. Laser filamentation is self-guidance of a high-power laser pulse propagating through a gas, liquid or solid material when self-focusing of the pulse is balanced by defocusing due to the laser-induced modifications in the material. This remarkable phenomenon finds a lot of applications such as table-top ultraviolet and x-ray generation, lightning guiding, rainmaking, selective radiotherapy on cancer cells, long-lived waveguides in air, and remote sensing of pollutants. This project will also promote basic science education to groups, such as grandparent-led rural families, who have been traditionally underrepresented in science.Laser filamentation is self-guidance of a high-power laser pulse when self-focusing due to the optical Kerr effect is balanced by defocusing due to material ionization and/or other nonlinear mechanisms. Although laser filamentation has been studied mainly using near-infrared and visible wavelengths, recent progress in ultrafast laser technology enables the investigation of laser filamentation using longer wavelengths such as mid-infrared and long-wavelength infrared. In this project, laser filamentation in solids will be experimentally studied by measuring plasma densities directly inside the filaments, with the experiments guided by 3-dimensional computer simulations of laser matter interactions. The project will impact filament-based technology such as new ultrabroadband and ultrashort light generation for spectroscopy and optical communications.

该研究项目将提高对固体中激光照射的物理机制和时空动力学的理解。 激光诱导是高功率激光脉冲在气体、液体或固体材料中传播的自导引，当脉冲的自聚焦通过由于激光诱导材料中的改性而引起的散焦来平衡时。 这一显著的现象发现了许多应用，如桌面紫外线和X射线产生，闪电引导，造雨，对癌细胞的选择性放射治疗，空气中的长寿命波导，以及污染物的遥感。 该项目还将促进对传统上在科学领域代表性不足的群体（如祖父母领导的农村家庭）的基础科学教育。激光诱导是高功率激光脉冲的自我引导，当由于光学克尔效应引起的自聚焦与由于材料电离和/或其他非线性机制引起的散焦相平衡时。 虽然主要使用近红外和可见光波长来研究激光发射，但是超快激光技术的最新进展使得能够使用更长波长（例如中红外和长波长红外）来研究激光发射。 在这个项目中，将通过直接测量细丝内的等离子体密度来实验研究固体中的激光诱导，实验由激光物质相互作用的三维计算机模拟指导。 该项目将影响基于量子点的技术，例如用于光谱学和光通信的新超宽带和超短光产生。

项目成果

Multi-octave-spanning supercontinuum generation through high-energy laser filaments in YAG and ZnSe pumped by a 2.4 μm femtosecond Cr:ZnSe laser

通过 2.4 μm 飞秒 Cr:ZnSe 激光器泵浦的 YAG 和 ZnSe 高能激光灯丝产生多倍频程超连续谱

• DOI: 10.1017/hpl.2021.1
• 发表时间: 2021
• 期刊: High Power Laser Science and Engineering
• 影响因子: 4.8
• 作者: Nam, Sang-Hoon;Nagar, Garima C.;Dempsey, Dennis;Novák, Ondřej;Shim, Bonggu;Hong, Kyung-Han
• 通讯作者: Hong, Kyung-Han

Single-shot visualization of the optical Kerr effect, ionization, and rotational Raman effect during laser matter interactions via frequency-domain holography

通过频域全息术对激光物质相互作用过程中的光学克尔效应、电离和旋转拉曼效应进行单次可视化

• 发表时间: 2021
• 期刊: Molecular and Optical Physics Meeting 2021
• 作者: Dempsey, Dennis;Nagar, Garima;Agnes, Jack;Berger, Russell;Shim, Bonggu
• 通讯作者: Shim, Bonggu

Wavelength-scaled laser filamentation in solids and plasma-assisted subcycle light-bullet generation in the long-wavelength infrared

固体中的波长尺度激光成丝和长波长红外中等离子体辅助的亚循环光弹产生

• DOI: 10.1103/physreva.98.023844
• 发表时间: 2018
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Grynko, Rostislav I.;Nagar, Garima C.;Shim, Bonggu
• 通讯作者: Shim, Bonggu

Simultaneous measurements of plasma densities and electron collision times in plasma via time-resolved interferometry

通过时间分辨干涉测量法同时测量等离子体中的等离子体密度和电子碰撞时间

• 发表时间: 2020
• 期刊: APS Division of Plasma Physics Meeting 2020
• 作者: Nagar, Garima;Dempsey, Dennis;Shim, Bonggu
• 通讯作者: Shim, Bonggu

Ultrafast observation of intense light-matter interactions in flexible glass via single-shot frequency domain holography

通过单次频域全息术超快观察柔性玻璃中强烈的光与物质相互作用

• DOI: 10.1364/fio.2020.fm1c.4
• 发表时间: 2020
• 期刊: Frontiers in Optics / Laser Science
• 作者: Dempsey, Dennis;Nagar, Garima C.;Renskers, Christopher K.;Grynko, Rostislav I.;Sutherland, James S.;Shim, Bonggu
• 通讯作者: Shim, Bonggu