Necati Kaya, PhD Candidate,
Texas A&M University, Department of Physics and Astronomy, College Station, TX 77843-4242
Office & Laboratories: MPHY 466, ENPH 104, ENPH B11
email: necati@physics.tamu.edu
Phone and Fax: +1 979 422 8958 / +1 979 845 2590

I am a PhD Candidate in the Department of Physics at Texas A&M University under the direction of Hans Schuessler, and working on Ultrafast Optics, Ultrashort laser filamentation in transparent media, Computer Generated Holography (CGH), Ion Beam Apparatus (IBA). My dissertation research is on The Dynamics Of Molecules In Intense Ultrashort Laser Fields: Measurements of Ultrashort, Intense Laser-induced Fragmentation of The Simplest Molecular Ion (H2+).

White-light generation using spatially-structured beams of femtosecond radiation
White-light generation is studied in water using spatially- structured beams of femtosecond radiation. By changing the transverse spatial phase of an initial Gaussian beam with a 1D spatial light modulator to that of an Hermite-Gaussian (HGn,m) mode, we were able to generate beams exhibiting phase discontinuities and steeper intensity gradients. When the spatial phase of an initial Gaussian beam (showing no significant white-light generation) was changed to that of a HG01, or HG11 mode, significant amounts of white-light were produced. Because self-focusing is known to play an important role in white-light generation, the self-focusing lengths of the resulting transverse intensity profiles were used to qualitatively explain this production. Distributions of the laser intensity for beams having step-wise spatial phase variations were modeled using the Fresnel-Kirchhoff integral in the Fresnel approximation. N. Kaya, J. Strohaber, A. A. Kolomenskii, G. Kaya, H. Schroeder and H. A. Schuessler, Optics Express 20, 13337 (2012)

In situ tomography of femtosecond optical beams with a holographic knife-edge
 In this paper we introduce a method for analysis of optical beams by using a folded version of a 2f-2f setup containing spatial phase modulator (SLM). The SLM is proven to be useful in producing diverse “soft apertures” that are difficult or impossible to reproduce mechanically. Phase hologram encoded with phase and amplitude information is used to knife edge the laser modes. Precise phase calibration of the SLM is reported. The measured powers from both mechanical and holographic knife-edge methods are found to be in a good agreement with each other. Important new analytic results are the knife-edge equations for the Hermite-Gaussian and Laguerre-Gaussian modes. In both cases good agreement is found between experiment and theory. Finally, the authors tomographically reconstruct a broadband optical beam in a folded 2f-setup. J. Strohaber, G. Kaya, N. Kaya, N. Hart, A. A. Kolomenskii, G. G. Paulus, and H. A. Schuessler, Optics Express, 19, 14321 (2011)

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