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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Generation of high harmonic frequencies in crystalline materials
 Gindl, Adam ; Kozák, Martin (advisor) ; Veselá, Petra (referee)
The interaction of intense ultrashort laser pulses with materials in the strong field regime of nonlinear optics enables the study of electron excitations with high temporal resolution. In this thesis, we focus on the experimental research of high harmonic ge- neration in crystalline silicon. The goal of our study is to reach the modulation of the amplitude and the phase of the generated field using coherence control by a superposition of optical fields at the fundamental and its third harmonic frequency. The modulation of the generated field occurs due to the change of the relative phase shift between the driving fields. The resulting amplitude and phase changes of the high harmonic field are investi- gated for different amplitude ratios of the driving fields using spectroscopic methods and spectral interferometry. The newly introduced spectral interferometry technique enables the measurement of the emission delay of high-energy photons on attosecond time scale. 1
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Nonlinear optical properties of metals
 Gindl, Adam ; Kozák, Martin (advisor) ; Žídek, Karel (referee)
We introduce fundamental nonlinear optical effects and various methods of their observation. Firstly we describe the essential theory of second-harmonic generation from a metallic boundary in detail. In the experiment, we observe this effect on silver and aluminium mirror. Then we introduce the Z-scan method, which allows us to determine the nonlinear refraction index and absorption coefficient from the measurement of the transmittance of the sample if this transmits light in the visible spectrum. A simple modification of this method permits the measurement of nonlinear optical parameters from the sample's reflectance also for materials that reflect light in the visible region. We focus on applying this method in the experiment for siliceous glass, silver, aluminium, dielectric and siliceous mirrors and optical filter OD 0,5.
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