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Öğe Controlling Femtosecond Laser Filaments via Quasi-Hermite Gaussian Beam Modes(Polish Acad Sciences Inst Physics, 2022) Kaya, N.; Kaya, G.; Kolomenski, A.; Schuessler, H.We present the possibilities of controlling and organizing femtosecond laser filaments and white-light formation via generating quasi-Hermite Gaussian beam modes in water. The quasi-Hermite Gaussian modes are created as transverse structures with different intensity and phase distributions by modulating the spatial phase front in the incident Gaussian beam. We have created phase masks on a spatial light modulator to produce desired beam profiles such as quasi-Hermite Gaussian beam modes. By creating the quasi-Hermite Gaussian beam modes from the incident Gaussian mode, we have shown that multiple filaments and white-light generation patterns can be controlled and organized depending on the created beam mode profile. Since only one initial beam was employed, the beam and the created side patterns were mutually coherent, which enables their use for pump-probe spectroscopy and other experiments requiring mutual coherence of the beams employed.Öğe Spatio-temporal control of femtosecond laser filamentation and white-light generation(American Institute of Physics Inc., 2017) Kaya, N.; Kaya, G.; Strohaber, J.; Kolomenskii, A.; Schuessler, H.Several possibilities are investigated to control spatio-temporal characteristics of the femtosecond filamentation process and the resulting white-light generation. We controlled the development of self-focusing, and resulting locations of filaments producing white-light in water by changing the transverse spatial phase of an initial Gaussian beam with a computer generated holographic technique and a spatial light modulator. We studied intense femtosecond filamentation and propagation of femtosecond pulses with different transverse modes in water. The filament propagation length was found to increase with Bessel-Gaussian modes of the beams, when more lateral lobes were used, under the conditions of the same peak intensity, pulse duration, and size of the central peak of the incident beam. We also investigated variations of white-light generation when the delay between the two pulses was varied. With a decrease of the relative delay, an enhancement of white-light output was observed, which at near-zero delays was reverted to a suppression of white-light generation. © 2017 Author(s).
