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Optimal Intensity Distribution in a Laser Beam for FSO Communications
Barcík, Peter ; Capsoni, Carlo (oponent) ; Číp, Ondřej (oponent) ; Wilfert, Otakar (vedoucí práce)
The doctoral thesis is focused on analysing the distribution of optical intensity within a radiated laser beam at the plane of the transmitting (TXA) and receiving (RXA) aperture which is affected by propagation through free space as well as through the atmosphere. The aim of the thesis is to determine the optimal intensity distribution of the laser beam at the transmitter plane which is less affected by turbulence during propagation and transmitter aperture itself. In order to analyse the propagation of an optical wave through atmospheric turbulence, the simulation based on the Split-Step method is utilized. The propagation of the Flattened Gaussian beam was analysed for weak and moderate turbulence regimes. The thesis discusses usage of multimode fiber with large diameter as a shaping element and includes a design of the refraction beam shaper which is able to convert the Gaussian beam to a flattened Gaussian beam. Finally, a model of a fully photonic transmitter and receiver was built. The system is used for generating and receiving an optical coherent wave.
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The distribution of relative variance of optical intensity in laser beam
Barcík, Peter ; Coufalíková,, Aneta (oponent) ; Hudcová, Lucie (vedoucí práce)
This master´s thesis provides basic properties and measurement of optical beams. In the first chapter is shown division of light on ray, wave and beam optics. Atmospheric optics and properties associated with propagation of light through the earth's atmosphere is presented in the second chapter. In the third part are shown basic techniques for Gaussian beam shaping. The last chapter deals with measurement of optical beam after propagating through a turbulent medium. In this section is shown distribution of relative variance of optical intensity in Gaussian and Top-Hat beam. There is also measured spatial coherence of laser beam in the turbulent atmospheric transmission media. Finally effect of the beam wander is investigated.
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Optimal Intensity Distribution in a Laser Beam for FSO Communications
Barcík, Peter ; Capsoni, Carlo (oponent) ; Číp, Ondřej (oponent) ; Wilfert, Otakar (vedoucí práce)
The doctoral thesis is focused on analysing the distribution of optical intensity within a radiated laser beam at the plane of the transmitting (TXA) and receiving (RXA) aperture which is affected by propagation through free space as well as through the atmosphere. The aim of the thesis is to determine the optimal intensity distribution of the laser beam at the transmitter plane which is less affected by turbulence during propagation and transmitter aperture itself. In order to analyse the propagation of an optical wave through atmospheric turbulence, the simulation based on the Split-Step method is utilized. The propagation of the Flattened Gaussian beam was analysed for weak and moderate turbulence regimes. The thesis discusses usage of multimode fiber with large diameter as a shaping element and includes a design of the refraction beam shaper which is able to convert the Gaussian beam to a flattened Gaussian beam. Finally, a model of a fully photonic transmitter and receiver was built. The system is used for generating and receiving an optical coherent wave.
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The distribution of relative variance of optical intensity in laser beam
Barcík, Peter ; Coufalíková,, Aneta (oponent) ; Hudcová, Lucie (vedoucí práce)
This master´s thesis provides basic properties and measurement of optical beams. In the first chapter is shown division of light on ray, wave and beam optics. Atmospheric optics and properties associated with propagation of light through the earth's atmosphere is presented in the second chapter. In the third part are shown basic techniques for Gaussian beam shaping. The last chapter deals with measurement of optical beam after propagating through a turbulent medium. In this section is shown distribution of relative variance of optical intensity in Gaussian and Top-Hat beam. There is also measured spatial coherence of laser beam in the turbulent atmospheric transmission media. Finally effect of the beam wander is investigated.
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