On the Role of Linear Processes in the Development and Evolution of Filaments in Air

Persistent Link:
http://hdl.handle.net/10150/194509
Title:
On the Role of Linear Processes in the Development and Evolution of Filaments in Air
Author:
Roskey, Daniel Eric
Issue Date:
2007
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
It is well known that ultrashort, high intensity pulses with peak powers exceedinga certain critical value (Pcr) undergo self-focusingleading to collapse and filamentation. During the initial stagesof propagation at low intensities the beamdynamics are dominated by diffraction and dispersion. During filamentation, self-focusing resulting from the nonlinear Kerr effect is balanced by higher order nonlinearities such as plasma induced defocusing and absorption.This work examines the role that linear processes combined with initial spatial and temporal conditioningplay in the generation and subsequent evolution of filaments within nonlinearbeams. It is demonstrated that, because of linear diffraction, initial spatial beam shaping can have a dramatic effect on the filament pattern, the number of filaments and the energy contained in each filament. These ideas are applicable to cases that arequite common, such as circularly apodized beams, and help to explain interestingbehavior observed in these types of beams. Finally, it is demonstrated thatwith appropriate preconditioning of multiple subcritical pulses, linear effects can be employed to accurately control when and where filamentation occurs during long distance propagation through conditional collapse of overlapping pulses.
Type:
text; Electronic Dissertation
Keywords:
nonlinear optics; filaments; light strings; filament control; nonlinear schroedinger
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Optical Sciences; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Wright, Ewan M
Committee Chair:
Wright, Ewan M.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleOn the Role of Linear Processes in the Development and Evolution of Filaments in Airen_US
dc.creatorRoskey, Daniel Ericen_US
dc.contributor.authorRoskey, Daniel Ericen_US
dc.date.issued2007en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractIt is well known that ultrashort, high intensity pulses with peak powers exceedinga certain critical value (Pcr) undergo self-focusingleading to collapse and filamentation. During the initial stagesof propagation at low intensities the beamdynamics are dominated by diffraction and dispersion. During filamentation, self-focusing resulting from the nonlinear Kerr effect is balanced by higher order nonlinearities such as plasma induced defocusing and absorption.This work examines the role that linear processes combined with initial spatial and temporal conditioningplay in the generation and subsequent evolution of filaments within nonlinearbeams. It is demonstrated that, because of linear diffraction, initial spatial beam shaping can have a dramatic effect on the filament pattern, the number of filaments and the energy contained in each filament. These ideas are applicable to cases that arequite common, such as circularly apodized beams, and help to explain interestingbehavior observed in these types of beams. Finally, it is demonstrated thatwith appropriate preconditioning of multiple subcritical pulses, linear effects can be employed to accurately control when and where filamentation occurs during long distance propagation through conditional collapse of overlapping pulses.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectnonlinear opticsen_US
dc.subjectfilamentsen_US
dc.subjectlight stringsen_US
dc.subjectfilament controlen_US
dc.subjectnonlinear schroedingeren_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineOptical Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorWright, Ewan Men_US
dc.contributor.chairWright, Ewan M.en_US
dc.contributor.committeememberWright, Ewan M.en_US
dc.contributor.committeememberMaloney, Jerome V.en_US
dc.contributor.committeememberAnderson, Brian P.en_US
dc.contributor.committeememberKolesik, Miroslaven_US
dc.identifier.proquest2278en_US
dc.identifier.oclc659748124en_US
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