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    Controlling Light-Matter Interactions and Spatio-Temporal Properties of Ultrashort Laser Pulses

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    Genre
    Thesis/Dissertation
    Date
    2012
    Author
    Coughlan, Matthew Anthony
    Advisor
    Levis, Robert J.
    Committee member
    Matsika, Spiridoula
    Borguet, Eric
    Lyyra, A. Marjatta
    Department
    Chemistry
    Subject
    Chemistry
    Optics
    Coherent Control
    Femtosecond
    Ultrashort
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/1013
    
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    DOI
    http://dx.doi.org/10.34944/dspace/995
    Abstract
    The SPECIFIC method a fast and accurate method for generating shaped femtosecond laser pulses. The femtosecond pulses are user specified from pulse parameters in the temporal domain. The measured spectral and recovered temporal phase and amplitudes from SEA TADPOLE are compared with the theoretical pulse profile from the user specified input. The SPECIFIC method has been shown to be a technique that can generate a diverse array of spectral/temporal phase and amplitude as well as polarization pulse shapes for numerous scientific applications. The spatio -temporal -spectral properties of focusing femtosecond laser pulses are studied for several pulse shapes that are important for non-linear spectroscopic studies. We have shown with scanning SEA TADPOLE that the spatio-spectral phase of focusing double pulse profile changes across the laterally across the beam profile. The spectral features of the sinusoidal spectral phase shaped pulse has been shown to tilt at with a changing angle away from the focus of the lens. Using spatio-spectral coupling, we have shown that multiple spatio-temporal foci can be generated along and perpendicular to the focusing direction of a femtosecond laser pulse. The spatial position of the spatio-temporal foci is controlled optically. Using sinusoidal spectral phase modulated pulse trains fragment ion production from Benzonitrile parent molecule can be controlled. A spectral transmission window perturbed the temporal pulse amplitudes resulting in fragment ion production dependant on spectral window position. The spectral window ion production was shown to also be dependant on temporal phase sequence.
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