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 9 of 9 for “"Wave Plate"”.
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A study of novel mid-infrared optical devices: Wave plates and tunable filters
The mid-infrared wavelength range is important for both molecular sensing and thermal imaging. However, many optical devices that are common in the visible range are not as accessible in the mid-infrared. In this thesis, we look to partially address this problem by proposing two novel structures …
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Electrooptic electric field sensor for dc and extra-low-frequency measurement
… effect of stimulated conductivity. The quarter-wave plate and the crystal of Lithium Niobate were identified as the main sources of temperature instability. A new method of temperature compensation of the quarter-wave plate is proposed. Due to the temperature instability of Lithium Niobate, …
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Characterization of Wideband All-Fiber Waveplates
… This is usually accomplished with bulk-optic wave plates which are inherently narrowband, bulky, and often require careful manual tuning and adjustments. H.C. Huang has recently proposed that a variably spun birefringent fiber with spin rate slowly varying from zero to very fast (or vice …
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The development of a crystal modulator using a multipath reflection technique
… crystals. This modulator does not require a half wave plate and can therefore operate at any optical wavelength as is also the case with some of the existing designs. But in addition, unlike the existing designs, this novel modulator allows for multicolour multibeam operation. Using four AOP …
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Development of high power fibre amplifier components, systems and applications
… used a dual Faraday rotator design with a half wave plate between the rotators to compensate for thermal stress induced birefringence. Using this approach the isolation was shown to be constant to greater than 60W. The isolator was also compensated for thermal lensing by balancing the positive …
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Plasmon hybridization in real metals
… of the Fano resonance can be tuned over a broad wavelength range. We show that the wavelength of the Fano resonance depends very sensitively on the dielectric permittivity of the surrounding media. Besides heptamer, we also used plasmon hybridization method and finite element method to …
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Differential polarisation studies of the deffuse interstellar band and Be stars
… 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'; position angles of the analyser may be set to within +0.5°. We present …
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Robotic Polarimetry of Blazars
… Ringo polarimeter 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 …
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Applications Of Linear And Nonlinear Optical Effects In Liquid Crystals
… high conversion efficiency while the shape and wave-front of the output beam are still of good quality. We also studied the dynamics of the OSS process itself and observed (in a numerical model) a number of notorious instabilities caused by effects of back-conversion iv process. Additionally, …