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Showing 1 to 20 of 28 for “"Fabry-Pérot"”.
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Analysis of SALT Fabry-Pérot medium resolution data
The Southern African Large Telescope Fabry-Pérot interferometer has been used in its medium resolution mode to observe three of 30 galaxies of the MHONGOOSE galaxy sample for which very deep HI observation (typically 200 hours/galaxy) will be obtained with MeerKAT. So optical high spatial …
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An Investigation of Dual-Band Fabry-Pérot Resonant Cavity Antennas
… we examine a dual-band version of the Fabry-Pérot resonant cavity antenna that uses a frequency selective surface (FSS) patch layer over a ground plane to form a composite artificial ground plane that replaces the single metal ground plane of the conventional structure. The structure …
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Analysis of Fabry-Pérot laser resonators stabilized by microlenses and applications in speckle-free imaging
… demonstrated by stabilizing macroscopic Fabry-Pérot resonators with microlens arrays. The cavity parameters are tunable to either force fundamental-mode lasing across the array or to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this …
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Trace gas imaging in the atmosphere with a Fabry-Pérot interferometer - a case study for sulfur dioxide
… In this thesis an imaging technique employing a Fabry-Pérot interferometer (FPI) is introduced. In order to identify and quantify a trace gas species, the FPI's transmittance spectrum is matched to the molecule's absorption structures. The method was investigated for sulfur dioxide (SO2) in a …
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Stable and unstable resonators within Fabry-Pérot optical cavities containing microlenses: laser arrays, low-coherence imaging, and fractal laser modes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Analysis of Photonic Structures for Optical Networks
… este tipo de estructuras dentro de una cavidad Fabry-Pérot. Se realiza un modelo matemático para el estudio teórico de la Biestabilidad Óptica Dispersiva en Láseres de Pozo cuántico de ganancia logarítmica en una cavidad resonante Fabry-Pérot. Con los resultados obtenidos del modelo matemático …
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Semiclassical Modeling of Optical Properties of Molecules in Cavity Environments
… and theoretical interest in recent years. Within Fabry-Pérot cavities, strong coupling is typically achieved by collective interactions of many chromophore molecules with cavity modes whereas for plasmonic cavities, the cavity field-matter coupling can be large enough to manifest strong coupling …
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Semiconductor Laser Device-Level Characteristics
… Laser (VCSEL), Distributed Feedback (DFB), and Fabry-Pérot (FP) lasers. The measurements of the DC characteristics are optical power versus drive current (L-I) curves (DFB, VCSEL) and optical spectra (FP, DFB, VCSEL). In addition, the high-speed optical detection measurement of the …
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Femtosecond-Laser-Enabled Fiber-Optic Interferometric Devices
… sapphire fibers, all-sapphire fiber-tip Fabry-Pérot cavity, and in-fiber Whispering-Gallery mode resonator
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Optical Fiber Tip Pressure Sensor
… connects the fiber end and a diaphragm to form a Fabry-Pérot cavity. The all-fused-silica structure fabricated directly on a fiber tip has little temperature dependence and can function very well with high resolution and accuracy at temperatures up to 600 °C. In addition to its miniature size, its …
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Validation des capteurs à fibre optique pour l'instrumentation des barrages en béton
… montrent que les capteurs à fibre optique Fabry-Pérot permettent le suivi des quatre paramètres énumérés ci-haut avec une exactitude comparable, sinon supérieure aux capteurs traditionnels. Il ressort également de cette étude que l'installation des capteurs à fibre optique, soit dans une …
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Development of optically interrogated diagnostic systems within materials ageing experiments
… Bragg grating (FBG) temperature sensors, fibre Fabry-Pérot (FFP) pressure sensors, O2sensing fluorescence probes, and optical fibre switches were assessed experimentally in experiments that lasted up to 1 year. A bespoke fibre-coupled multi-pass spectroscopic gas cell was developed for the …
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GaN-based distributed feedback laser diodes and their applications
… are directly compared to commercially-available Fabry-Pérot (FP) LDs, with DFBs demonstrating improved modulation characteristics and spectral precision compared to FPs, while emitting light at similar optical powers. Recent fabrication improvements has also improved threshold conditions of GaN …
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Aktive Regionen der Sonnenoberfläche und ihre zeitliche Variation in zweidimensionaler Spektro-Polarimetrie
… Spektro-Polarimetrie. Die Daten wurden mit dem Fabry-Pérot-Interferometer der Universität Göttingen am Vakuum-Turm-Teleskop auf Teneriffa erfasst. Von der aktiven Region NOAA 9516 wurde der volle Stokes-Vektor des polarisierten Lichts in der Absorptionslinie bei 630,249 nm in Einzelaufnahmen …
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Monolithically integrated, high coherence frequency comb generation through on-chip gain switching
… a two laser design is used where a gain switched Fabry–Pérot laser is phase locked to a single mode laser creating a primary-secondary configuration. Different coupling techniques were investigated and developed, with stable combs being generated as a result of bidirectional coupling, and greater …
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High-speed modulation of semiconductor lasers and properties of silver-coated quantum-dot lasers
… silver-coated and uncoated quantum-dot Fabry-Pérot lasers are also presented. Room temperature, continuous-wave lasing is demonstrated in several silver-coated devices. The modal gain and group index are extracted from observation of the below threshold amplified spontaneous emission …
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Low Loss Integrated Photonic Devices and Their Applications in Astrophotonics and Quantum Information
… (>200nm 3-dB bandwidth). We also study a Fabry-Pérot Bragg grating cavity enhanced four wave mixing process on a Si3N¬4/SiO2 platform, from an analytical treatment to an experimental demonstration. A unique grating loss reduction and a dispersion compensation technique is also …
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Broadband Coherent Perfect Absorption in One-Dimensional Optical Systems
… of loss. As a concrete example, we consider a Fabry-Pérot resonator containing a lossy dielectric and confirm this model through a computational study of a 1-micron-thick silicon layer in a cavity formed of dispersive mirrors with aperiodic multilayer design. We confirm that one may achieve …
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Homogenization of Structured Metasurfaces and Uniaxial Wire Medium Metamaterials for Microwave Applications
… clearly explained in terms of the open/coupled Fabry-Pérot resonators. The methodology can be useful in the design of wideband planar filters based on these metasurfaces with a specific response. The second part focuses on the development of homogenization models for wire medium loaded with …
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