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.
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Showing 1 to 17 of 17 for “"beam splitter"”.
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50%-50% Beam Splitters Using Transparent Substrates Coated by Single- or Double-Layer Quarter-Wave Thin Films
A pair of light beams that have orthogonal polarizations and equal intensity can be generated through reflection and refraction of a monochromatic light at a dielectric surface. Sytematic procedures to design beam splitters which can produce such output light beams are described in this thesis. Two …
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Polarizing Optical Devices Based on Embedded One-Dimensional Subwavelength-Structured Photonic-Crystal Layers
… procedure for the design of a polarizing beam splitter (PBS) that uses a form-birefringent, subwavelength-structured, one-dimensional photonic-crystal layer (SWS 1-D PCL) embedded in a high-index cubical prism is presented. The PBS is based on index matching and total transmission for the …
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The Diode Laser Source and the Spatial Light Modulator's Driver Electronics for Miniaturized Holographic 3D Imaging
… of the SLM and the distortion due to the beam splitter on the structured output from the LIM are explained.
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Optical pyrometry for noncontact temperature measurement
… energy radiated from the molten particle to a beam splitter, where it is split into two signals. Each signal is filtered and focused onto an indium antimonide (InSb) photodetector which is liquid nitrogen (LN₂) cooled. A ratio of the detectors' outputs indicates the temperature of the molten …
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LIGO interferometer operating at design sensitivity with application to gravitational radiometry
… the interferometer to more than 200 Watt at the beam splitter. This required the commissioning of both a thermal compensation system and shot noise limited sensing electronics capable of detecting all the light. Additionally, a series of unexpected noise sources had to be mitigated. This work is …
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Interferometry with higher-dimensional gauge-symmetric optical multiports
… system: the passive scattering centers--such as beam-splitters or other material distributions--which redistribute the energy carried by incident photons, and the phase delays that freely propagating photons experience between pairs of these scattering centers. When an interferometer is modeled …
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Numerical and Laboratory Studies of Ultrasonic Anderson Localization
… study was performed by scattering a beam of 7 MHz ultrasound at a cell containing a slurry of glass or PMMA spherical beads and water, and measuring the backscattered energy as a function of angle. In accord with theoretical predictions, an enhanced backscatter peak with a width of 12 …
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Photon Arrival Time Quantum Random Number Generation
… common relying on the behavior of a photon at a beam-splitter, producing a random bit dependent on which of the two paths in which the photon is detected. However, these are totally limited by detector saturation rates, typically in the low MHz range. We previously proposed that by instead using …
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Optical cavity integrated surface ion trap for enhanced light collection
… distant quantum memories by interfering on a beam splitter. Efficient remote entanglement generation relies upon efficient light collection from single ions into a single mode fiber. This can be realized by integrating an ion trap with an optical cavity and employing the Purcell effect for …
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Experiments with Bose-Einstein condensates in a double-well potential
… interferometry without need for a conventional beam splitter or recombiner. The Josephson-like phase dynamics of the coherent optical coupling was investigated and it was experimentally shown that the induced atomic currents depend on the relative phase of the two condensates and an additional …
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Evaluation of GLO: a Solar Occultation Instrument for Measuring Atmospheric Trace Species on CubeSat Missions
… GFCR channels. Scaling corrections were made for beam splitter inaccuracy and SNR was characterized for frame collection. Different cameras were tested to weigh accuracy versus cost of a camera baffle. Using the Langley plot method, solar intensity versus changes in the solar zenith angle were …
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Coherent excitation of ultracold atoms between ground and Rydberg states
… ground states a pair of phase stable Raman beams is required. Both beams are derived from a single master laser before being spatially separated into individual components using a novel Faraday filtering technique. The frequency dependent Faraday effect in an isotopically pure thermal vapour …
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Differential polarisation studies of the deffuse interstellar band and Be stars
… system. The device uses a polarising beam splitter for selecting a plane of polarisation, and a quarter-wave plate to remove most 90%) of the effects of instrumental polarisation. The throughput of the analyser is --, 40%. The analyser may be rotated at a rate of up to 12.5° s'; …
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Fermionic Quantum Information in Surface Acoustic Waves
… that it is possible to create a single-electron beam splitter by tuning the voltages applied to various parts of the device and I calculate the range of voltages in which quantum information is preserved and manipulated accurately. These results were verified experimentally by collaborators at …
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Robotic Polarimetry of Blazars
… design) with a rotating half-wave plate and beam splitter. MOPTOP's design minimises exposure times, allowing more frequent observations and a better sampling of data. A densely sampled monitoring program that is not interrupted by periods of sunlight would be highly desirable for the study …
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High-power fibre lasers
… the normally high mismatch between diode laser beams and inner cladding areas of fibre lasers. <br/><br/>Chapter Three consists of a review of cladding-pumped fibre lasers. It describes how inner cladding geometry and pump absorption limits the output power scalability of these devices. …
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The Effects of Parkinson's on Fixational Stability
Parkinson's disease (PD) is a progressive, neurological movement disorder. The stability of eye movements in PD is not well understood but many patients report difficulty doing tasks that require stabilized fixation and gaze. The ability to stabilize an image on the retina is critical is acquiring …