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 38 for “"optical spectrum"”.
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Aspheric geodesic lenses for an integrated optical spectrum analyser
Abstract available p. xiii-xiv
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A Theoretical Analysis of A Complex Optical Spectrum Analyzer
Made available in DSpace on 2014-12-12T20:54:35Z (GMT). No. of bitstreams: 1 7726626.pdf: 3327031 bytes, checksum: e395936b35d7125b4b09e67ba443306b (MD5) Previous issue date: 1977
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Measurement and assignment of the size-dependent optical spectrum in cadmium selenide (CdSe) quantum dots
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Optical excitations in cold gases
… the effects of interparticle interactions on the optical spectrum of cold gases. We first consider homogenous gas in the weak excitation regime and find that the optical spectrum of a system of Bosons is highly sensitive to interactions. We find that optical excitations, at temperatures low enough …
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Optical spectroscopy study of correlated electron physics in ABC-stacked trilayer graphene
… which focuses on the low-frequency response, the optical spectrum is an important way to detect the frequency-dependent response and extract the underlying physics. In this project, we measured the optical spectrum on an ABC-stack trilayer graphene sample with the photocurrent method to understand …
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Studies of the chlorinating intermediate of horseradish peroxidase
… enzymatic halogenating intermediate known. The optical spectrum of Compound X is virtually identical to the optical spectrum of Compound II. Titration of Compound X by a single electron donor, potassium ferrocyanide reduces the Compound II type spectrum to a native type spectrum. Incubation of …
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Broadband electrooptic modulators based on gallium arsenide materials
Optical Arbitrary Waveform Generation (OAWG) combines frequency combs and frequency-by- frequency pulse shapers to synthesize optical waveforms. The OAWG technique has a wide variety of applications, ranging from high resolution imaging, Light Detecting and Ranging (LIDAR) systems for high …
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Thermal and photochemical vapor deposition of aluminum nitride and gallium nitride
Currently, the optical spectrum of the III-V compound semiconductors has been largely confined, with a few notable exceptions, to the visible red-orange to infrared portion of the electromagnetic spectrum ($\sim$650 nm to $\sim$1550 nm). The AlGaN material system may be able to extend this range to …
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Applications and noise properties of high repetition rate : TiSapphire frequency combs
… are a unique laser technology due to their broad optical bandwidth and potential for linking the optical and radio frequency domains when these lasers are configured as frequency combs. Ti:Sapphire based mode-locked lasers offer considerable advantages over other laser systems by generating both …
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Development of Optoelectronic Devices and Computational Tools for the Production and Manipulation of Heavy Rydberg Systems
… novel design is presented for a highly sensitive optical spectrum analyzer for displaying laser mode structure in real time. Utilizing programmable microcontrollers to read data from a CMOS image sensor illuminated by the diffraction pattern from a Fabry-Perot interferometer, this device can …
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First principles calculations on ZnO non-equilibrium phase
In this thesis work, the electronic and optical properties for the non-equilibrium boron-nitride phase of ZnO have been studied. To understand the difference between the BN phase and the equilibrium WZ phase, first principles approaches such as DFT, hybrid functional and the GW approximation have …
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Bragg grating sensor interrogation using in-line, dual-mode fiber demodulators
Optical fiber Bragg gratings, first demonstrated by Hill in 1978 [1], will see increasing deployment as sensors in smart structure applications due to their minimal insertion loss and small profile. Bragg grating sensors provide narrowband reflections from a periodic index discontinuity. Strain and …
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Simulation, Fabrication, and Characterization of Semiconductor Lasers
… 139.91 A/cm2 for infinite cavity length. Optical spectrum measurement showed wavelength around 892 nm to 898 nm for all the lasers. External differential quantum efficiency is measured for different cavity lengths from which internal quantum efficiency is found 85.5% and also internal loss …
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Devitrification Kinetics and Optical Stability of Optical Fibers at High Temperatures
Reliable sensing and monitoring systems based on optical fibers operating at high temperatures and in harsh environments are of high demand. One of the limitations of such systems is the devitrification of the fused silica based core and cladding glass at elevated temperatures. Crystallites can …
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Strain sensor using fiber bragg grating interrogation
… FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however there have some restriction to monitor by using OSA. The usage of OSA are very costly, bulky and has slow scanning speed. Therefore, research is …
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Miniaturized Chip-Scale Quantum and Terahertz Systems Through Tight Integration of Electronics, Electromagnetics, and Qubits
… and high-flexibility manipulation of the RF-to-optical spectrum. This thesis presents innovations of chip-scale quantum and THz systems, which allow for significant miniaturization, practical solutions, and exciting research opportunities across the device, circuit, and system levels. To …
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Imaging through scattering
… thesis we demonstrate novel methods to overcome optical scattering in order to resolve information about hidden scenes, in particular for biomedical applications. Imaging through scattering media has long been a challenge, as scattering corrupts scenes in a non-invertible way. The use of …
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Novel Optical Sensors for High Temperature Measurement in Harsh Environments
… analysis, and performance evaluation of novel optical high temperature sensors suitable for harsh environment applications. For the first time to our knowledge, an optical temperature sensor based on the broadband polarimetric differential interferometric (BPDI) technology is proposed and …
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Composite Films for Modifying Evanescent Wave Characteristics in Long-Period Grating Biosensors
… mixtures and demonstrate a rapid response. Fiber optical immunosensors based on long-period gratings have limited sensitivity at the refractive index of ordinary aqueous solutions (~1.33). A composite film was designed to raise the local refractive index of the sensor, thus increasing sensitivity. …
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Geometry and Light in Quantum Optical Systems
This thesis looks at a range of quantum optical system with an emphasis on the geometrical structure. We first consider two coupled systems, a pair of 2-level systems and pair harmonic oscillators, with specific couplings to the environment through a Lindblad master equation. We look at observables …
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