Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Etalon"”.
-
Pivot-Point-Independent Mode-Hop-Free Tunable Laser with a Large Tuning Range and Narrow Linewidth
… dynamic forces.<br/><br/>In this thesis, the etalon is employed as a mode selector in the laser system, and the narrow band filter is also employed to ensuring the single wavelength output. To avoid mode hopping, we need to find a cavity design that allows the cavity mode/frequency changes …
-
Intracavity coherent interaction of mode-locked pulse train with resonant medium
… namely rubidium-87 (Rb-87) vapor and Fabry-Perot etalon, placed inside a laser cavity are studied in the light of developing ultra-sensitive laser sensors to measure a small magnetic field and a minute change of index of refraction of a sample material, respectively. A Rb-87 vapor provides an …
-
Investigation of Narrowband Acousto-Optic Tunable Filters for Semiconductor Laser Tuning
… nm. However, the laser displayed significant etalon effects in its spectral output. This motivated the construction of a ring-cavity based on an InP semiconductor optical amplifier. This laser produced >5 mW over 1600 – 1750 nm, with ~0.3 nm linewidths and no etalon effects observed in the …
-
Dielektromos nedvességmérők kalibrációátvitelét befolyásoló tényezők = Factors affecting the calibration transfer of dielectric moisture meters
… berendezést szabványosítottak, amelynek van egy etalon példánya az Egyesült Államok Gabonafelügyeleténél (USDA-GIPSA), amelyhez a többi azonos típusú egységeket sztenderdizálják, és ezekkel lehet a hivatalos nedvességtartalmat meghatározni. Ennek a megoldásnak több hátránya van. Egyrészt nem …
-
Konzeption und Umsetzung neuer Technologien zur biaxialen Winkelmessung und elektrooptischen Pseudostreckenmessung
… Hierzu gehören das kardanisch aufgehängte Etalon, die temperaturstabilisierte Laseroptik und die temperaturkalibrierte CCD der Winkelmesseinheit (Reflexgoniometer), die Systeme zur Erzeugung und Detektion ultrakurzer Laserpulse, eine elastische Optik, Möglichkeiten zur Formung des …
-
Semi-analytic simulations of microring resonators with scattering elements
… at the design wavelength. Furthermore, a grating etalon can be used to obtain an ultra-narrow transmission filter or sharp cut-off mirror. The thesis will present semi-analytical solutions to easily anticipate the resultant reflection from the ring for a given scattering element. The results are …
-
Acetylene-filled pressure broadened short photonic microcells
… in finding the line center, but a larger etalon-like effect which is approximately 13%, appears on the wings of the optical depth. By using a tapering technique, we were able to decrease the etalon-like effect to less than 1%. In both cases, the microcells could be connectorized, albeit …
-
OPTICAL BISTABILITY IN ZINC-SULFIDE AND ZINC-SELENIDE THIN-FILM INTERFERENCE FILTERS AND IN GALLIUM-ARSENIDE AND COPPER-CHLORIDE ETALONS (NONLINEAR).
… Trans- verse effects in GaAs superlattice etalons are observed which cannot be explained on the basis of a plane-wave analysis. The optical nonlinearity in GaAs and diffraction combine to produce drastic effects on the measured beam profiles and bistable loops, due to an intensity-dependent …
-
High-resolution infrared spectroscopy in pursuit of C60 and other astrochemical targets
… on side-of-fringe locking to a solid germanium etalon; in order to maintain continuous wavelength tuning, the free spectral range of the etalon is tuned by stepping its angle with respect to the incident laser. This has allowed us to stabilize the laser to acceptable levels while maintaining the …
-
Symmetry Specific Study of Ozone Isotopomer Formation
… cell and a calibrated confocal Fabry-Perot etalon. All atmospherically relevant, i.e. the simply 17O or 18O substituted ozone isotopomers could thereby be quantified. Precision in the measurement of the isotope abundance was improved to 0.3%. Systematic errors in earlier investigations were …
-
Development of a three-dimensional camera based on subsampled optical coherence tomography (OCT)
… source with an intra-cavity Fabry-Perot etalon to provide a wavelength-stepped output. Using this source in an existing OCT system, we show that we can passively compress signals across a large depth range into a limited RF bandwidth. Next, to demonstrate high-speed optical domain …
-
The Lunar Exosphere: Spatial and Temporal Variations of Sodium and Potassium Emissions from November 2013 to May 2014
… and instrument testing phases. We used a dial etalon Fabry-Perot spectrometer with a resolving power of 180,000 (1.7 km s-1) to measure the line widths and radial velocity shifts to the sodium D2 (5889.9506 Å) and potassium D1 (7698.9646 Å) emission lines. The instrument's three arcmin field …
-
Experimental and theoretical investigations of molecular ions by spectroscopy as well as ion mobility and mass spectrometry
… a prism and a grating in one dimension, and an etalon in the second dimension. This instrument was successfully employed for the acquisition of Raman and laser-induced breakdown spectra. Different spectroscopic methods (light scattering and fluorescence spectroscopy) permitting a spatial as well …
-
A Remote Observatory for Geocoronal Hydrogen Emissions
… pointing at sky targets, a pressure-tuned dual-etalon FPI to allow for high spectral resolution (R_80,000) measurements, and several charge-coupled device (CCD) imagers for guiding and collecting data. The environment is fully monitored using temperature, humidity, barometric pressure, and wind …
-
Metody přesného měření nízkých impedancí
… a konstrukčně jednoduchých vypočitatelných etalonů odporu, které jsou použity jak ke kalibraci můstku, tak i jako referenční etalony pro vlastní měření. V další části práce je popsán návrh digitálního vzorkovacího můstku v různých topologiích pro kalibrace nízkých impedancí v kmitočtovém …