scholarly journals A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

2015 ◽  
Vol 118 (23) ◽  
pp. 233305 ◽  
Author(s):  
J. M. Palomares ◽  
A. Kohut ◽  
G. Galbács ◽  
R. Engeln ◽  
Zs. Geretovszky
Keyword(s):  
Atmospheric Pressure ◽  
Spark Discharge ◽  
High Current ◽  
Time Resolved ◽  
Time Resolved Imaging ◽  
Electrical Study

The Formation and Growth of a Stabilized Spark Discharge

1972 ◽  
Vol 26 (3) ◽  
pp. 323-353 ◽  
Author(s):  
J. P. Walters
Keyword(s):  
High Precision ◽  
Atmospheric Pressure ◽  
Spark Discharge ◽  
Electrode Erosion ◽  
Time Resolved ◽  
Chemical Mechanisms ◽  
Space Charges ◽  
Electrode Space ◽  
Quarter Wave ◽  
Discharge Formation

The production and properties of a spatially stabilized atmospheric pressure spark discharge are described. Nanosecond experiments are reported on controlled discharge formation via an electronically driven, quarter wave, current injection spark source at repetition rates up to 3000 per second. Formation of electrode space charges, acceptance of current by the discharge, electrode erosion, time-resolved spectral output, and potential analytical applications are treated. Chemical mechanisms for discharge formation and growth from electrically generated metastable argon are presented. Methods for high precision stroboscopic discharge observation are developed and used for verification of stabilization processes.

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.

scholarly journals Time-resolved imaging refractometry of microbicidal films using quantitative phase microscopy

2011 ◽  
Vol 16 (12) ◽  
pp. 120510 ◽  
Author(s):  
Matthew T. Rinehart ◽  
Tyler K. Drake ◽  
Francisco E. Robles ◽  
Lisa C. Rohan ◽  
David Katz ◽  
...  
Keyword(s):  
Time Resolved ◽  
Quantitative Phase ◽  
Phase Microscopy ◽  
Quantitative Phase Microscopy ◽  
Time Resolved Imaging
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