A Study of the Fundamental Science Underlying the Transport of Intense Femtosecond Laser Pulses in the Atmosphere PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
We have identified and confirmed that ultrafast intense Ti-sapphire laser pulses after propagating through an optical medium self-transform into chirped white light laser pulses as manifested by the generation of supercontinuum. During the propagation of such pulses in air, self-focusing and filamentation take place together with strong field interaction with molecules in its path. Some important physical processes were studied. In particular, we observed a new type of fluorescence from the air molecules characteristic of intense field ionization and fragmentation unexpected from normal wisdom of plasma emission. An analytical tunnel ionization model of air molecules that agree with our experimental results was developed. It could be used in any theoretical modelling of such propagation. New techniques were developed to study the dynamics of filamentation. They allowed us to observed directly for the first time the signature of re-focusing The dependence of filamentation on various laser parameters such as the chirp, the divergence, etc. was also measured. Preliminary results agree with what we expect based on current knowledge of ultrafast nonlinear optics.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
We have identified and confirmed that ultrafast intense Ti-sapphire laser pulses after propagating through an optical medium self-transform into chirped white light laser pulses as manifested by the generation of supercontinuum. During the propagation of such pulses in air, self-focusing and filamentation take place together with strong field interaction with molecules in its path. Some important physical processes were studied. In particular, we observed a new type of fluorescence from the air molecules characteristic of intense field ionization and fragmentation unexpected from normal wisdom of plasma emission. An analytical tunnel ionization model of air molecules that agree with our experimental results was developed. It could be used in any theoretical modelling of such propagation. New techniques were developed to study the dynamics of filamentation. They allowed us to observed directly for the first time the signature of re-focusing The dependence of filamentation on various laser parameters such as the chirp, the divergence, etc. was also measured. Preliminary results agree with what we expect based on current knowledge of ultrafast nonlinear optics.
Author: See Leang Chin Publisher: Springer Science & Business Media ISBN: 1441906886 Category : Science Languages : en Pages : 138
Book Description
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: Eugene G. Gamaly Publisher: CRC Press ISBN: 9814267805 Category : Science Languages : en Pages : 350
Book Description
This is the first comprehensive treatment of the interaction of femtosecond laser pulses with solids at nonrelativistic intensity. It connects phenomena from the subtle atomic motion on the nanoscale to the generation of extreme pressure and temperature in the interaction zone confined inside a solid. The femtosecond laser-matter interaction has al
Author: Claude Rulliere Publisher: Springer Science & Business Media ISBN: 0387017690 Category : Science Languages : en Pages : 438
Book Description
This is the second edition of this advanced textbook written for scientists who require further training in femtosecond science. Four years after pub- cation of the ?rst edition, femtosecond science has overcome new challenges and new application ?elds have become mature. It is necessary to take into account these new developments. Two main topics merged during this period that support important scienti?c activities: attosecond pulses are now gen- ated in the X-UV spectral domain, and coherent control of chemical events is now possible by tailoring the shape of femtosecond pulses. To update this advanced textbook, it was necessary to introduce these ?elds; two new ch- ters are in this second edition: “Coherent Control in Atoms, Molecules, and Solids”(Chap.11)and“AttosecondPulses”(Chap.12)withwell-documented references. Some changes, addenda, and new references are introduced in the ?rst edition’s ten original chapters to take into account new developments and updatethisadvancedtextbookwhichistheresultofascienti?cadventurethat started in 1991. At that time, the French Ministry of Education decided that, in view of the growing importance of ultrashort laser pulses for the national scienti?c community, a Femtosecond Centre should be created in France and devoted to the further education of scientists who use femtosecond pulses as a research tool and who are not specialists in lasers or even in optics.
Author: Eugene G. Gamaly Publisher: CRC Press ISBN: 1000522830 Category : Technology & Engineering Languages : en Pages : 294
Book Description
This book describes the ultra-short laser–matter interactions from the subtle atomic motion to the generation of extreme pressures inside the bulk of a transparent crystal. It is the successor to Femtosecond Laser–Matter Interactions: Theory, Experiment and Applications (2011). Explanation and experimental verification of the exceptional technique for the phase transformations under high pressure are in the core of the book. The novel phase formation occurs along the unique solid-plasmasolid transformation path: the memory of the initial state is lost after conversion to plasma. New phase forms from chaos during the cooling to the ambient. The pressure-affected material remains detained inside a pristine crystal at the laboratory tabletop. Unique super-dense aluminium and new phases of silicon were created by the confined micro-explosions. The text also describes the recent studies that used the quasi-non-diffracting Bessel beams. The applications comprise the new high-pressure material formation and micromachining. The book is an appealing source for readers interested in the cutting-edge research exploring extreme conditions and creating nanostructures at the laboratory tabletop.
Author: Publisher: ISBN: Category : Languages : en Pages : 56
Book Description
This report results from a contract tasking the Institute of Atmospheric Optics, Siberian Branch, as follows: the contractor will investigate theoretically the interaction between femtosecond propagation effects and atmospheric turbulence, supercontinuum emission (spectral broadening), nonlinear scattering by atmospheric aerosols, and theoretical upper and lower limits for nonlinear propagation effects. The specific project objectives are as follows: (1) The theoretical study of powerful femtosecond laser pulse filamentation in the turbulent atmosphere; (2) Researching the supercontinuum cone emission mechanism by numerical simulation of high-power femtosecond laser pulse propagation in the atmosphere; and (3) The theoretical and experimental study of the fundamental problems of scattering of a high-power femtosecond pulse in the atmosphere: nonstationary light scattering in gases and aerosols; nonlinear inelastic nonstationary light scattering by aerosol particles. (26 figures, 73 refs.).
Author: Sergeĭ Aleksandrovich Akhmanov Publisher: American Institute of Physics ISBN: Category : Science Languages : en Pages : 392
Book Description
"Blurb & Contents" The wave optics of ultrashort pulses--an area experiencing rapid growth--is closely scrutinized in this completely up-to-date survey, which emphasizes new problems connected with the propagation of the shortest possible pulses. You'll find a presentation of the principles of the Fourier optics of short wave packets propagating in linear dispersive media. Discusses the development of femtosecond laser systems along with the feasibility of controlling pulse shape. Contents: Short Optical Pulses in Linear Dispersive Media. Self-action of Optical Pulses; Self-modulation, Self-compression, Solitons, and Instabilities. Parametric Interactions and Coherent Scattering of Femtosecond Pulses. Fast Phase Control. Compression and Shaping of Optical Pulses. Optical Solitons. Picosecond and Femtosecond Pulses in Optical Information Systems.
Author: 
Author: 
Author: See Leang Chin
Author: Eugene G. Gamaly
Author: Claude Rulliere
Author: Eugene G. Gamaly
Author: 
Author: 
Author: S. Abbas Hosseini
Author: Claude Rullière
Author: Sergeĭ Aleksandrovich Akhmanov