National Repository of Grey Literature 26 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
SMV-2020-26: Iodine cells
Hrabina, Jan ; Holá, Miroslava ; Oulehla, Jindřich ; Pokorný, Pavel ; Lazar, Josef ; Šarlejová, Tatiana ; Šlechtický, Stanislav
The contractual research was oriented towards development of the optical frequency references intended for frequency stabilization of compact laser sources. These optical references were based on absorption cells filled with ultra-pure absorption gases and they allow precise locking of the lasers with the methods of laser spectroscopy. The cells will serve as the references of optical frequencies in systems of primary length standards (633 nm wavelength).
Combination of laser spectroscopy methods for chemical analysis
Holub, Daniel ; Novotný, Karel (referee) ; Pořízka, Pavel (advisor)
The topic of this Master’s thesis is combination of laser spectroscopic methods. LIBS and Raman spectroscopy were chosen for the combination. This combination is applied to plastic identification and separation as a mean to automate sorting of plastic waste. Data handling was done via different methods of computer learning algorithms scripted in R language. Plastic sorting accuracy over 90 % was reached thanks to the combination of chosen methods. This work also addresses some issues implied by combination of two different methods.
SMV-2019-73: Optical frequency references
Lazar, Josef
Development of optical frequency references with multipath configuration, quartz glass windows, perpendicular to cell axis, plan-parallel, useful aperture 32 mm, resp. 36 mm, cold finger in the center, windows with optical quality surfaces /10 @ 633 nm for the clear aperture with antireflection coating on both sides, residual reflectivity < 0.1% at 532 nm wavelength, high reflection coatings on outer surfaces at ¾ of horizontal diameter of the useful aperture. Filling: Iodine – 127I.
SMV-2019-72: Optical frequency references
Lazar, Josef
Development of optical frequency references of quartz glass with optical quality windows, useful aperture 24 mm (diameter of the external and internal AR coatings for the 1550 nm wavelength), length 250 mm, filling pin (with transition from quartz glass to pyrex) in the center, windows with surfaces flatness λ/10 @ 633 nm for the clear aperture, filling: Isotopically pure Acetylene.
SMV-2019-71: : Optical frequency references
Lazar, Josef
Development of optical frequency references with wedged windows with 1° angle, useful aperture 36 mm of quartz glass alternatively with plan-parallel windows, useful aperture 10 mm (diameter of the external and internal AR coatings for the 532 nm wavelength), No cold fingers, windows with optical quality surfaces λ/10 @ 633 nm for the clear aperture. Filling: Iodine – 127I, limited amount referring to saturation temperature υ = 70°C.
SMV-2019-33: Optical reference for stabilized laser
Hrabina, Jan ; Holá, Miroslava ; Oulehla, Jindřich ; Pokorný, Pavel ; Lazar, Josef ; Šarlejová, Tatiana ; Šlechtický, Stanislav
The contractual research was oriented towards development of the optical frequency reference intended for frequency stabilization of ultra-compact laser sources. This optical reference was based on absorption cell filled with ultra-pure absorption gases and it allows precise locking of the lasers with the methods of laser spectroscopy. The cell uses special multi-pass arrangement of measuring laser beams and it is equipped with combined antireflective and highly-reflective dielectric coatings on its optical windows.
SMV-2019-34: Spectroscopic references
Hrabina, Jan ; Holá, Miroslava ; Oulehla, Jindřich ; Pokorný, Pavel ; Lazar, Josef ; Šarlejová, Tatiana ; Šlechtický, Stanislav
The contractual research was oriented towards development of the optical frequency references intended for frequency stabilization of ultra-compact laser sources. This optical reference were based on absorption cells filled with ultra-pure absorption gases and they allow precise locking of the lasers with the methods of laser spectroscopy. The cells use special opto-mechanical arrangement ensuring their ability to withstand in-satellite operation.
SMV-2019-35: Acetylene cells
Hrabina, Jan ; Holá, Miroslava ; Oulehla, Jindřich ; Pokorný, Pavel ; Lazar, Josef ; Šarlejová, Tatiana ; Šlechtický, Stanislav
The contractual research was oriented towards development of the optical frequency references intended for frequency stabilization of ultra-compact laser sources. These optical references were based on absorption cells filled with ultra-pure absorption gases and they allow precise locking of the lasers with the methods of laser spectroscopy. The cells will serve as the references of optical frequencies in systems of primary length standards (1530-1550 nm wavelengths).
Design of motorized optical system used for focusing of a laser beam
Zobač, Evžen ; Novotný, Karel (referee) ; Novotný, Jan (advisor)
This diploma thesis deals with the structural and optomechanical design of automatization of focusing laser beam for a remote laser spectroscopy device. The chosen solution uses an active rangefinder and a rotary unit to control the change of the focus plane of the device's optic system. The dependence of the focus plane’s change on the shift of lens in the focus plane was practically measured. For proper control of the rotary unit, this dependency is needed. Structural parts were made based on the created drawing documentation. The structural parts were mounted in the existing assembly of the device together with the purchased components. The proposed solution enables a change of the optical system, for example, in order to obtain a more appropriate range of focal planes.
Time-resolved spectroscopy of wide-bandgap semiconductors
Martínek, Miroslav ; Trojánek, František (advisor)
In this thesis experimental samples of multiple quantum wells in the InGaN/GaN structures will be compared using methods of laser spectroscopy. In particular, the optical properties of the samples will be investigated. The samples were prepared under different conditions; therefore one of the aims is to compare them. The knowledge of the influence of preparation enables utilization not only for fundamental research, but also for the construction of radiation sources or scintillation detectors. Measurements of absorption and photoluminescence will be carried out and their dynamic properties will be measured as well. There will be examined the effect of different excitation power and different excitation wavelength on the intensity of photoluminescence. From dynamic properties there will be examined the effect of different excitation wavelength on the lifetime of the absorption and how does temperature influence the lifetime of the photoluminescence. Individual quantities will be compared amongst samples and their suitability for further applications will be discussed.

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