National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Properties of color centers in diamond studied by methods of femtosecond laser spectroscopy
Streshkova, Neli ; Malý, Petr (advisor) ; Dzurňák, Branislav (referee)
In this work, we focus on the interaction of SiV color centers in diamond with femtose- cond light pulses. In the theoretical part, a script is developed to simulate the experimen- tal varying stripe length method and the effects of saturated optical gain are investigated. In the experimental part, photoluminescence and transient differential absorption under non-resonant excitation are studied. The result of the luminescence measurements are estimates of the effective cross-sections of single-photon absorption for the wavelengths 620 nm, 515 nm and 340 nm, as well as the effective cross-section of three-photon absorp- tion for 2000 nm. The result of the differential absorption measurements is the relaxation constant of the excited level of the SiV center and the upper estimate of the time duration of the initial dynamics. 1
Femtosecond absorption spectroscopy for study of stimulated emission
Streshkova, Neli ; Malý, Petr (advisor) ; Zukerstein, Martin (referee)
The aim of the thesis is the building and optimization of an experimental setup for me- asuring the transient transmission and optical gain by the femtosecond pump and probe technique. The setup combines the technology of parametric generation of pump pulses with tunable wavelength and the generation of femtosecond continuum as a spectrally wide probe. In the thesis, conditions of supercontinuum generation in bulk fused silica are extensively studied from a practical viewpoint. The performance of the setup was tested on two types of samples: the solution of rhodamine 6G in methanol and the semiconduc- tor nanocrystalline sample - CdSSe-doped glass. Time resolved spectra of the transient transmission of both samples were measured and the spectral dependence of the optical gain in rhodmine 6G was obtained. 1
Femtosecond absorption spectroscopy for study of stimulated emission
Streshkova, Neli ; Malý, Petr (advisor) ; Zukerstein, Martin (referee)
The aim of the thesis is the building and optimization of an experimental setup for me- asuring the transient transmission and optical gain by the femtosecond pump and probe technique. The setup combines the technology of parametric generation of pump pulses with tunable wavelength and the generation of femtosecond continuum as a spectrally wide probe. In the thesis, conditions of supercontinuum generation in bulk fused silica are extensively studied from a practical viewpoint. The performance of the setup was tested on two types of samples: the solution of rhodamine 6G in methanol and the semiconduc- tor nanocrystalline sample - CdSSe-doped glass. Time resolved spectra of the transient transmission of both samples were measured and the spectral dependence of the optical gain in rhodmine 6G was obtained. 1

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