Investigation of laser produced Fe plasma plume dynamics using time resolved imaging and snow plow model

2008 ◽  
Author(s):  
S. Mahmood ◽  
L. Jiaji ◽  
S. V. Springham ◽  
T. L. Tan ◽  
R. S. Rawat ◽  
...  
Keyword(s):  
Plasma Plume ◽  
Time Resolved ◽  
Plume Dynamics ◽  
Time Resolved Imaging

Evolution and Dynamics of Excimer Laser Vaporized YBa2Cu3O7−δ

1992 ◽  
Vol 285 ◽  
Author(s):  
R. C. Dye ◽  
R. Brainard ◽  
S. R. Foltyn ◽  
R. E. Muenchausen ◽  
X. D. Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Excimer Laser ◽  
Film Growth ◽  
Pulsed Laser ◽  
Spot Size ◽  
Laser Deposition ◽  
Time Resolved ◽  
Plume Dynamics ◽  
Time Resolved Imaging

ABSTRACTPulsed laser deposition of thin films is a technology whose fundamental processes are often poorly understood. Because of the difficulty of monitoring in real time either the ablation process itself (the laser-solid interaction), or thin film growth (plume-substrate interaction), studies have largely relied on diagnostic studies of the ablated plume and the resulting film to infer details about other steps in the process. Information gained from this approach has helped improve the production of high-temperature superconducting thin films.We have studied plume dynamics during the in-situ pulsed laser deposition of YBa2Cu3O7−δ thin films. The 248 and 308 nm lines of an excimer laser were used to generate a plume from a bulk YBa2Cu3O7−δ target. Both fast intensified CCD imaging and spectral diagnostics were used to monitor plume dynamics. Variations in the plume distribution as a function of processing gas, pressure, fluence, energy, and spot size were monitored by film composition and spectral-and time-resolved imaging.

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

scholarly journals Time-Resolved Imaging of Electrochemical Switching in Nanoscale Resistive Memory Elements

2015 ◽  
Vol 21 (S3) ◽  
pp. 1911-1912
Author(s):  
William A. Hubbard ◽  
E. R. White ◽  
Alexander Kerelsky ◽  
G. Jasmin ◽  
Jared J. Lodico ◽  
...  
Keyword(s):  
Resistive Memory ◽  
Time Resolved ◽  
Time Resolved Imaging
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