scholarly journals Time-resolved imaging of material response following laser-induced breakdown in the bulk and surface of fused silica

2010 ◽  
Author(s):  
Rajesh N. Raman ◽  
Raluca A. Negres ◽  
Paul DeMange ◽  
Stavros G. Demos
Keyword(s):  
Fused Silica ◽  
Time Resolved ◽  
Material Response ◽  
Laser Induced Breakdown ◽  
Time Resolved Imaging

scholarly journals Comparison of material response in fused silica and KDP following exit surface laser- induced breakdown

2013 ◽  
Author(s):  
Stavros G. Demos ◽  
Raluca A. Negres ◽  
Rajesh N. Raman ◽  
Alexander M. Rubenchik ◽  
Michael D. Feit
Keyword(s):  
Fused Silica ◽  
Material Response ◽  
Exit Surface ◽  
Laser Induced Breakdown ◽  
Surface Laser

Material response during nanosecond laser induced breakdown inside of the exit surface of fused silica

2013 ◽  
Vol 7 (3) ◽  
pp. 444-452 ◽  
Author(s):  
Stavros G. Demos ◽  
Raluca A. Negres ◽  
Rajesh N. Raman ◽  
Alexander M. Rubenchik ◽  
Michael D. Feit
Keyword(s):  
Fused Silica ◽  
Nanosecond Laser ◽  
Material Response ◽  
Exit Surface ◽  
Laser Induced Breakdown

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.

Determination of Carbon Content in Steel Using Laser-Induced Breakdown Spectroscopy

1992 ◽  
Vol 46 (9) ◽  
pp. 1382-1387 ◽  
Author(s):  
J. A. Aguilera ◽  
C. Aragón ◽  
J. Campos
Keyword(s):  
Carbon Content ◽  
Matrix Effects ◽  
Sample Surface ◽  
Nitrogen Atmosphere ◽  
Laser Induced Breakdown Spectroscopy ◽  
Time Resolved ◽  
Breakdown Spectroscopy ◽  
Use Of Time ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy has been used to determine carbon content in steel. The plasma was formed by focusing a Nd:YAG laser on the sample surface. With the use of time-resolved spectroscopy and generation of the plasma in nitrogen atmosphere, a precision of 1.6% and a detection limit of 65 ppm have been obtained. These values are similar to those of other accurate conventional techniques. Matrix effects for the studied steels are reduced to a small slope difference between the calibration curves for stainless and nonstainless steels.

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