Time-resolved imaging of CaF2 poly-crystal response following 355 nm nanosecond laser irradiation

2021 ◽  
Author(s):  
Jiuling Meng ◽  
Tao Lü ◽  
Yong Jiang ◽  
Rong Qiu
Keyword(s):  
Laser Irradiation ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Time Resolved Imaging

Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

2016 ◽  
Vol 108 (21) ◽  
pp. 211602 ◽  
Author(s):  
Dongfeng Qi ◽  
Dongwoo Paeng ◽  
Junyeob Yeo ◽  
Eunpa Kim ◽  
Letian Wang ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Nanosecond Laser ◽  
Silver Films ◽  
Time Resolved

scholarly journals Giant enhancement of THz-frequency optical nonlinearity by phonon polariton in ionic crystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yao Lu ◽  
Qi Zhang ◽  
Qiang Wu ◽  
Zhigang Chen ◽  
Xueming Liu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Nonlinearity ◽  
Ionic Crystals ◽  
Nonlinear Optical Susceptibility ◽  
Time Resolved ◽  
Light Coupling ◽  
Tremendous Progress ◽  
Fundamental Research ◽  
Ionic Contribution ◽  
Time Resolved Imaging

AbstractThe field of nonlinear optics has grown substantially in past decades, leading to tremendous progress in fundamental research and revolutionized applications. Traditionally, the optical nonlinearity for a light wave at frequencies beyond near-infrared is observed with very high peak intensity, as in most materials only the electronic nonlinearity dominates while ionic contribution is negligible. However, it was shown that the ionic contribution to nonlinearity can be much larger than the electronic one in microwave experiments. In the terahertz (THz) regime, phonon polariton may assist to substantially trigger the ionic nonlinearity of the crystals, so as to enhance even more the nonlinear optical susceptibility. Here, we experimentally demonstrate a giant second-order optical nonlinearity at THz frequency, orders of magnitude higher than that in the visible and microwave regimes. Different from previous work, the phonon-light coupling is achieved under a phase-matching setting, and the dynamic process of nonlinear THz generation is directly observed in a thin-film waveguide using a time-resolved imaging technique. Furthermore, a nonlinear modification to the Huang equations is proposed to explain the observed nonlinearity enhancement. This work brings about an effective approach to achieve high nonlinearity in ionic crystals, promising for applications in THz nonlinear technologies.

Laser-induced fabrication of porous gold nanoshells

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20108-20112 ◽  
Author(s):  
Tae-Hyeon Park ◽  
Du-Jeon Jang
Keyword(s):  
Raman Scattering ◽  
Laser Irradiation ◽  
High Surface ◽  
Gold Nanoshells ◽  
Nanosecond Laser ◽  
Scattering Efficiency ◽  
Porous Gold ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Hollow and porous gold nanoshells with high surface-enhanced Raman scattering efficiency have been fabricated through utilizing nanosecond laser irradiation.

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