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Measurement of optical lenses parameters
Wintr, Aleš ; Coufalíková,, Aneta (referee) ; Hudcová, Lucie (advisor)
This paper contains a basic overview and description of optical lenses. It introduces different types of optical lenses and shows how they influence the passing of light beams. It deals with the production of optical lenses and their practical use. It describes types of optical blemishes that exist in real optical systems. Particular attention is given to parameters of optical lenses and their measurement in practice. It includes a Matlab program to calculate parameters of optical lenses derived from the measurements.
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Measurement of the optical intensity distribution at the far field
Vitásek, Jan ; Němeček, Jiří (referee) ; Wilfert, Otakar (advisor)
The topic of this master’s thesis is energy measurement of the optical intensity distribu-tion at the far field. Properties of the optical intensity and the optical power are described. In this thesis solution of wave equation is done. The plane wave, spherical wave and Gaussian beam are described. In this thesis, optical trace of laser beam from transmitter laser diode to receiver PIN photodiode is described. One of the solved problems is diffraction on the lens socket. The basic configuration for diffraction investigation on lens socket was created. There were transmitting laser diode, stop with circular apertures and PIN photodiode used in the experiment. In the other part, thesis deals with measuring and detection of the optical beam. Sorts of photodiodes and their characteristics were analysed.
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Optical beam intensity profile analysis
Fojtík, Jakub ; Vitásek,, Jan (referee) ; Barcík, Peter (advisor)
This work is focused on the study of the intensity profile of optical beams. In the first part problematics of optical beams from theoretical point of view is discussed, Model of realistically circular symmetric beam in an ideal lossless, stationary, homogeneous and isotropic medium is formed in Matlab®. The next part of the thesis deals with implementation of automatic workplace for measuring intensity profile of optical beams. Within the thesis - PCB desing of photodetector in Eagle®, is discussed. Custom application for controlling the motorized linear stage M – IMS 400 and communication with photodetector in the Microsoft Visual Studio 2010® was created.
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Top hat beam in free space optics
Golda, Martin ; Wilfert, Otakar (referee) ; Hudcová, Lucie (advisor)
This thesis describes a way of laser beam shaping of Gaussian profile to Top hat profile and the influence of atmospheric turbulences and attenuation on both these beam profiles. Its aim is to get acquainted oneself with a structure of atmosphere, principle of optical radiation which is used in free space communication and the influence of atmosphere on laser beam. To be successful in creation of beam with Top hat profile is necessary to study the principle of focusing by using the plano-convex lenses and other diffraction elements. This thesis compares the influence of atmospheric turbulences and attenuation between Gauss and Top hat beam results for two different wavelengths.
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Model of atmospheric transmission media for free space optics
Přikryl, Petr ; Vlček, Čestmír (referee) ; Wilfert, Otakar (advisor)
The aim of this thesis is to study the methods of a free space optical link design and its application in the communication technologies. The thesis describes possible intrusive influences on the transmitted optical signal, which are the signal noise, atmospheric attenuation and atmospheric turbulences. The thesis is particulary focused on the influence of the atmospheric turbulences and atmospheric attenuation on the optical beam.
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Quantification of turbulence by the Equivalent Temperature Gradient
Kovaľová, Alžbeta ; Látal,, Jan (referee) ; Hudcová, Lucie (advisor)
The diploma thesis is focused on the optical beam propagating in the atmosphere in a wireless communication optical link. The first part of the work explains the atmospheric transmission media with turbulence and its effects on reliability of the optical system. The second part introduces methods for turbulence determination based on a statistical approach to turbulence quantification are introduced. In the third part, method of equivalent temperature gradient is described with the advantage of immediate turbulence evaluation. The output of this thesis is the model of turbulent environment formed by the optical elements. Analysis of turbulent properties and non-reciprocal nature of turbulent channel is processed by a 2D simulator based on the mentioned model and method of equivalent temperature gradient.
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Modelling of the disperion properties of the atmosphere in vertical and slant direction
Holub, Josef ; Látal,, Jan (referee) ; Hudcová, Lucie (advisor)
This diploma thesis deals with the propagation of the optical beam through the Earth's atmosphere in the vertical and oblique directions. The work describes the properties of the Earth's atmosphere and parameters of atmosphere and its effects on the propagation of the optical beam, especially the optical dispersion. As part of the work, a model of optical beam propagation through the atmosphere was created in two versions, script and user-graphic. The model was created in the MATLAB environment and allows to draw the profile of the refractive index of the environment for the specified wavelength of radiation, it contains other graphical and numerical outputs.
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Laser beam shaping
Hantl, Josef ; Dvořák, Filip (referee) ; Hudcová, Lucie (advisor)
Thesis describes shortly types of waves and beams. Gaussian beam properties and parameters are described in more details, Gaussian beam is the most used in atmospheric optical links. The main goal of work is studying of possibilities of laser beam shaping, mainly the beam Top hat. In this project reasons why is suitable to shape laser beam for optical communications and the most used methods for shaping of laser beam are described. The suggested processes of beams shaping are experimentally verified and properties of beams shaped of single methods are compared with each other.
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Modelling of the disperion properties of the atmosphere in vertical and slant direction
Holub, Josef ; Látal,, Jan (referee) ; Hudcová, Lucie (advisor)
This diploma thesis deals with the propagation of the optical beam through the Earth's atmosphere in the vertical and oblique directions. The work describes the properties of the Earth's atmosphere and parameters of atmosphere and its effects on the propagation of the optical beam, especially the optical dispersion. As part of the work, a model of optical beam propagation through the atmosphere was created in two versions, script and user-graphic. The model was created in the MATLAB environment and allows to draw the profile of the refractive index of the environment for the specified wavelength of radiation, it contains other graphical and numerical outputs.
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