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 20 of 45 for “"Optical phase"”.
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Uniaxial optical phase change metamaterials
Optical metamaterials are artificially engineered materials with exceptional electromagnetic properties that cannot be found in nature. Over the last 20 years, optical metamaterials have driven forward a plethora of fields from telecommunications to solar energy harvesting. They owe their unique …
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Terfenol based optical phase modulator and magnetometer
Two new fiber optic magnetostrictive phase modulators and magnetometers using the highly magnetostrictive rare-earth iron compound Tb<sub>x</sub>Dy<sub>l-x</sub>Fe₂ are investigated. They demonstrated to have a high sensitivity, dynamic range, minimum field detectability, and a better structural …
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An optical phase locked loop for semiconductor lasers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Focusing Light Inside Scattering Media with Optical Phase Conjugation
… beyond ~1 mm deep inside the media to achieve optical imaging and manipulation. Hence, the ability to focus light deep inside scattering media is highly desired, and it could revolutionize biophotonics by enabling deep-tissue non-invasive high-resolution optical microscopy, optical tweezing, …
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Deep learning enabled multiscale optical phase imaging for biomedical applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Improving the reliability of optical phase change materials-based devices
Optical components are part of our daily lives, including vision and camera systems, data transmission in telecommunication, sensing applications, manufacturing and medicine, and more. Compact on-chip integrated optics such as photonic integrated circuits and optical metasurfaces can provide us …
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Quantum limited optical phase detection in a high power suspended interferometer
… this type is the ability to detect differential phase shifts between the beams returning to the beamsplitter from the Fabry-Perot arm cavities. To achieve the planned sensitivity to gravitational radiation, this detection should be limited only by photon courting statistics ("shot noise") at a …
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Reconfigurable Photonics based on Broadband Low-loss Optical Phase Change Materials
Optical phase change materials (O-PCMs), a unique group of materials featuring drastic optical property contrast upon solid-state phase transition, have found widespread adoption in photonic switches and routers, reconfigurable meta-optics, reflective display, and optical neuromorphic computers. …
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Developing and testing of a prototype electro-optical phase encoded position transducer
… of a proposed idea for a prototype electro-optical phase encoded position transducer was conducted. The intensity of two IR LED beams were modulated sinusoidally at frequency omega, with a 90 degree temporal phase difference. They further modulated by a pair of sinusoidal optical encoding …
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Space-variant optical phase retarders in liquid crystal polymers and their applications
… investigations were performed to achieve optical phase retarders with a space-variant orientation of their fast axis. These retarders present unique behaviors and they can be used for several applications such as polarization analysis, beam splitting, phase mask coronagraphy, optical …
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Basic module for an integrated optical phase difference measurement and correction system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Fast and efficient optical phase conjunction using a degenerate Raman System in rubidium
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater
… circuits (PICs) and the integration of phase change materials (PCMs) enables promising designs which are compact, non-volatile, and efficient. However, conventional PCMs such as Ge₂Sb₂Te₅ (GST) introduce significant optical absorption loss, leading to elevated insertion losses in …
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Efficient, fast, low power, optical phase conjugation using two-photon-induced Zeeman coherence in rubidium
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Measurement of the local optical phase and amplitude in photonic devices using scanning near-field microscopy
This thesis presents the optical characterisation of various photonic devices using scanning near-field microscopy (SNOM). The SNOM technique has a unique capability of achieving a resolution beyond the diffraction limit. Placing the SNOM into the arm of a heterodyne interferometer also enables the …
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Passive and active Bragg gratings for optical networks
… and applications of two groups of devices: the optical phase en/decoders and the tunable fibre Bragg gratings based on an S-bending technique. The advantage of an S-bending tuning FBG is that its central wavelength is invariant as the linear strain gradient along the FBG is altered. Two new …
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One-Dimensional MEMS Optical Phased Array Systems Based on Surface Micro-Machined Silicon Mirrors for Scanning LiDAR Applications
Optical phased array (OPA) systems are an emerging technology for lightweight and miniature LiDAR scanners due to their compact size and construction that eliminate the need for robust physical moving parts, leading to a fast response, high reliability, and low power requirements. MEMS based OPA …
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The quasi mode-locked regime: glassy disorder and turbulent dynamics in fiber laser
… laser, a new and largely unexplored operating phase where intensity fluctuations reveal complex collective behavior. Although this regime may be familiar to experimentalists working with mode-locked lasers, the QML has not been systematically studied in a fiber laser, and only recently has its …
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Impact of the boundary layer on pointing and tracking in airborne free-space laser communication links
… was the use of a deformable mirror to recreate optical phase distortions from boundary layer turbulence. Experiments were conducted with realistic channel effects for multiple look angles between a subsonic aircraft at 29 kft and geosynchronous satellite. Performance was determined by power …
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