Energy Deposition In Air From Femtosecond Laser Filamentation For The Control Of High Voltage Spark Discharges PDF Download
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Author | : Guillaume Point |
Publisher | : |
Total Pages | : 256 |
Release | : 2015 |
Genre | : |
ISBN | : |
Download Energy Deposition in Air from Femtosecond Laser Filamentation for the Control of High Voltage Spark Discharges Book in PDF, ePub and Kindle
Author | : See Leang Chin |
Publisher | : Springer Science & Business Media |
Total Pages | : 138 |
Release | : 2010-03-10 |
Genre | : Science |
ISBN | : 1441906886 |
Download Femtosecond Laser Filamentation Book in PDF, ePub and Kindle
This book attempts to give a discussion of the physics and current and potential applications of the self-focusing of an intense femtosecond laser pulse in a tra- parent medium. Although self-focusing is an old subject of nonlinear optics, the consequence of self-focusing of intense femtosecond laser pulses is totally new and unexpected. Thus, new phenomena are observed, such as long range lam- tation, intensity clamping, white light laser pulse, self-spatial ltering, self-group phase locking, self-pulse compression, clean nonlinear uorescence, and so on. Long range propagation at high intensity, which is seemingly against the law of diffraction, is probably one of the most exciting consequences of this new sub- eld of nonlinear optics. Because the intensity inside the lament core is high, new ways of doing nonlinear optics inside the lament become possible. We call this lamentation nonlinear optics. We shall describe the generation of pulses at other wavelengths in the visible and ultraviolet (UV) starting from the near infrared pump pulse at 800 nm through four-wave-mixing and third harmonic generation, all in gases. Remotely sensing uorescence from the fragments of chemical and biological agents in all forms, gaseous, aerosol or solid, inside the laments in air is demonstrated in the labo- tory. The results will be shown in the last part of the book. Through analyzing the uorescence of gas molecules inside the lament, an unexpected physical process pertaining to the interaction of synchrotron radiation with molecules is observed.
Author | : S. Abbas Hosseini |
Publisher | : |
Total Pages | : 344 |
Release | : 2005 |
Genre | : |
ISBN | : |
Download Control of Filamentation of Intense Femtosecond Laser Pulses Propagating in Air Book in PDF, ePub and Kindle
Author | : Doyle D. Knight |
Publisher | : Cambridge University Press |
Total Pages | : 463 |
Release | : 2019-02-21 |
Genre | : Science |
ISBN | : 1107123054 |
Download Energy Deposition for High-Speed Flow Control Book in PDF, ePub and Kindle
Describes energy deposition using direct current (DC), microwave and laser discharge for flow control at high speeds.
Author | : |
Publisher | : |
Total Pages | : 2 |
Release | : 2000 |
Genre | : |
ISBN | : |
Download Laser Filamentation of a Femtosecond Pulse in Air at 400nm Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 2003 |
Genre | : |
ISBN | : |
Download Localized Flow Control in High Speed Flows Using Laser Energy Deposition Book in PDF, ePub and Kindle
The capability for localized flow control in high speed flows using laser energy deposition has been investigated in a collaborative computational and experimental program. Three proposed applications have been comprehensively studied. First, two models of laser energy deposition in air have been developed and validated by comparison with experiment. The first model is an engineering approach wherein the laser energy deposition is treated as an energy release in a perfect gas. The second model is a detailed physical approach which incorporates real gas chemistry with an eleven species model of air. Comparison with experimental measurements of static temperature, density and velocity (one-component) show good agreement with both models outside the plasma region. Second, a detailed 3-D simulation of laser energy deposition upstream of intersecting shocks at Mach 3.45 demonstrated the capability to force transition from Mach Reflection (MR) to Regular Reflection (RR) in the Dual Solution Domain. This result is particularly important for control of MR to RR transition in high speed inlets for scramjet-powered air vehicles. A companion experimental study showed a momentary reduction in the Mach stem height by 70%, but a Mach Reflection was recovered apparently due to freestream turbulence. Third, detailed 3-D simulations of laser energy deposition upstream of an isolated sphere and an Edney IV interaction at Mach 3.45 were performed. Results show the fundamental features observed in the accompanying experiments.
Author | : Hanieh Fattahi |
Publisher | : Springer |
Total Pages | : 140 |
Release | : 2016-08-23 |
Genre | : Technology & Engineering |
ISBN | : 9783319369907 |
Download Third-Generation Femtosecond Technology Book in PDF, ePub and Kindle
This thesis offers a thorough and informative study of high-power, high-energy optical parametric chirped pulse amplifications systems, the foundation of the next generation of femtosecond laser technology. Starting from the basics of the linear processes involved and the essential design considerations, the author clearly and systematically describes the various prerequisites of the nonlinear optical systems expected to drive attosecond physics in the coming decade. In this context, he gives an overview of methods for generating the broadband and carrier-envelope-phase stable seed pulses necessary for producing controlled electric-field waveforms in the final system; provides a guide to handling the high-power, high-energy pump lasers required to boost the pulse energy to the desired operating range; describes the design of the nonlinear optical system used to perform the amplification, including modes of operation for ultra-broadband infrared-visible pulses or narrowband (yet still ultrafast) pulses tunable over multiple octaves; and finally presents a prospective high-energy field synthesizer based upon these techniques. As such, this work is essential reading for all scientists interested in utilizing the newest generation of ultrafast systems.
Author | : American Institute of Aeronautics and Astronautics |
Publisher | : |
Total Pages | : 1024 |
Release | : 2006 |
Genre | : Aeronautics |
ISBN | : |
Download AIAA Journal Book in PDF, ePub and Kindle
Author | : Suyash Bajpai |
Publisher | : |
Total Pages | : 0 |
Release | : 2023 |
Genre | : |
ISBN | : |
Download TRANSIENT OPTICAL NONLINEARITIES ENGENDERED BY FEMTOSECOND LASER FILAMENTATION IN GASES Book in PDF, ePub and Kindle
The laser filamentation process in gases and its consequences have been at the center of interest over the three recent decades. The filament wake channel is formed by the laser pulse as a highly nonequilibrium and optically underdense plasma column. The contents of the plasma evolve towards equilibrium, giving rise to various transient optical effects. When filamentation occurs in a dense gas, it leads to the production of the excessively high density of excited atoms as compared to the density of ions. We used a kinetic model of the competing electron-collisional processes in the case of high-pressure argon gas and explored the sensitivity of the resulting excited-to-ionized atoms number density ratio to the envelope shape of the driving laser pulse. Considering three different families of the pulse shapes, we have shown that the ratio of excited atoms to ions in the dense gas can be manipulated and further increased. To further investigate the structure of the plasma column, we studied the filamentation process at the crossing of two laser beams. We have shown that in this case the process is significantly affected by the transient intensity grating caused by the beam interference in the crossing area, which leads to the formation of a microscopically structured filament wake channel. In particular, the grating of excited atom density is formed in the channel. We obtained characteristics of such excitation gratings that are controlled by the spatial and temporal characteristics of the crossing pulses. A nonlinear optical effect that is crucial in the context of excess excited atoms is the Rabi sideband generation. The Rabi sideband patterns from a one-dimensional plasma channel have already been studied. We considered theoretically the probing of the above-mentioned excitation gratings by a picosecond laser beam of 800 nm carrier wavelength and the formation of the characteristic spatial-spectral patterns of the Rabi sidebands. We demonstrated the sensitivity of these Rabi sideband patterns towards the grating characteristics, probe beam shape and wavelength and to the position of the observation screen and the observation slit on the screen. As our capstone work, we explored filamentation of long-wavelength laser pulses in atmospheric-pressure gases, as this situation effectively meets the dense gas criteria. We worked at transforming the theoretical and computational techniques that we developed for high-pressure gases at typical laser wavelengths (~800 nm) to be applicable to atmospheric-pressure gases at longer laser wavelengths (~3900 nm). Intense, ultrashort laser pulses of these latter carrier wavelength values just recently have become available for experiments and carry a great promise for applications in atmospheric optics, atmospheric chemistry, and related disciplines.
Author | : |
Publisher | : |
Total Pages | : 596 |
Release | : 2004 |
Genre | : Aeronautics |
ISBN | : |
Download AIAA Aerospace Sciences Meeting and Exhibit, 42nd Book in PDF, ePub and Kindle