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 “"Dual wavelength"”.
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A dual wavelength fiber optic strain sensing system
… problem. This thesis investigates the use of dual wavelength interferometry to overcome this limitation. Possible systems configurations based on dual wavelength interferometry were considered, and the comprehensive design and implementation of a dual laser time division multiplexed (TOM) …
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Generation of pulsed dual wavelength erbium doped fiber laser
Single and dual wavelength fiber lasers and pulsed fiber lasers are well-known to be used for various applications. In the generation of dual wavelength fiber lasers and pulsed fiber lasers, the researchers found the mode competition among the dual wavelength is caused by the cross-gain saturation …
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Wide stripe single and dual wavelength mode semiconductor diode lasers
… stripe diode lasers with respect to emission wavelength, external gratings such as volume Bragg gratings have been used. These external gratings not only significantly drive up the cost of such integrated systems but also have their drawbacks in that they are very sensitive to mechanical …
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Theoretical and Instrumental Development of a Dual Wavelength Spectrophotometric Instrument for Equilibrium Methods of Analysis
Made available in DSpace on 2014-12-13T20:09:45Z (GMT). No. of bitstreams: 1 7606915.pdf: 5249418 bytes, checksum: 43b4b6a7a1f86fe6b51592895f657a5f (MD5) Previous issue date: 1975
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Quantifying structural change in UK woodland canopies with a dual-wavelength full-waveform terrestrial laser scanner
… Canopy Analyser (SALCA), a research TLS with dual-wavelength full-waveform capabilities.There were three key objectives to this research: (1) the development of a radiometric calibration for the SALCA instrument to produce an apparent reflectance product, (2) the separation of SALCA point …
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On a dual wavelength optical sensor system for measuring strain and temperature simultaneously in tokamak port plug
… The fibre sensor is an off the shelf solution dual-wavelength fibre Bragg grating. The thesis proposes a method of coating the fibre in layers of silver and copper to protect this sensor. A new method of embedding the fibre in a stainless steel piece is described using a silver solder to couple …
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Integrated Multiwavelength Semiconductor Lasers
… of lasing modes with as much control over the wavelength and linewidth as in today's single-wavelength semiconductor lasers. By utilizing multiple sections of periodic structures, dual-wavelength InGaAs-GaAs ridge waveguide semiconductor lasers have been fabricated. Not only do these …
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Measurement of retinal vascular permeability in a rat model using spectroscopic optical coherence tomography
… for measuring blood oxygenation using multiple wavelengths, have been demonstrated and developed. In this thesis, a dual-wavelength spectroscopic OCT technique is investigated to detect and quantify retinal vascular permeability changes in a small animal model. By injecting an intravascular dye …
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The use of loop mirrors and chirped fibre Bragg gratings in actively-modelocked fibre lasers
… for gain, and are actively-modelocked using a dual-wavelength nonlinear optical loop mirror (NOLM) as a modulator. Control over the operating wavelength and intra-cavity dispersion is obtained using a chirped in-fibre Bragg grating.Systems operating both at 76MHz and gigahertz frequencies are …
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An optical computed tomography scanner for three dimensional gel dosimetry of radiotherapy dose distributions
… tomography (CT) scanning using visible light wavelengths has been under investigation and development for much of this time. A lack of clinical uptake of the systems developed to date suggests that there are deficiencies or unappealing aspects, such as optical CT scanner maintenance and …
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Switching and generation of ultrashort pulses using all-fibre devices
… placed in-fibre Bragg reflector as a wavelength selective loss element in the basic NOLM configuration, both soliton self-switching and dual-wavelength control-pulse switching are spectrally quantised. Results are presented from a novel dual-wavelength laser configuration generating …
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New techniques for multiple wavelength fiber laser generation based on edfa and tdfa
Multiple wavelength fiber laser (MWFL) can be a potential source for microwave generation as the conventional microwave generator have several issues in generating high frequency. In order to be such source, the MWFL must have the following criterion; a great number of comb lines, a compact design, …
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Photosensitivity and Photodarkening of UV-induced Phosphate Glass Fiber Bragg Gratings and Application in Short Fiber Lasers
… lasers is investigated. A 3.5-cm-long single-wavelength single-longitudinal-mode distributed feedback (DFB) fiber laser has been implemented in the 1%-2% Er/Yb doped phosphate glass fiber. A laser signal with an output power of 27.5 mW at a linewidth of 20 MHz is achieved. In addition, a …
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High power ultra-short pulse Quantum-dot lasers
… versatility in the range of 1.1 µm – 1.3 µm wavelengths is demonstrated through novel mode-locking regimes such as dual-wavelength mode-locking, wavelength bistability and broad tunability. Moreover, broad pulse repetition rate tuning using an external cavity configuration is presented. A …
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Biophysical Studies Aimed at Potential Therapies of Hemoglobin Associated Diseases
… and RBC deformability. A Hemox Analyzer, a dual-wavelength spectrophotometer, was used to measure oxygen affinity in sRBC treated with a potential drug intended to improve oxygen affinity. Deformability, the ability of the cells to elongate when exposed to shear, was measured as a function …
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CE-LIF ANALYSIS OF INTACT MARINE MICROBES ALONG WITH THEIR CONSTITUENT PHYCOBILIPROTEINS AND PHYCOBILIN PIGMENTS
… Capillary electrophoresis (CE) methods with dual-wavelength laser induced fluorescence (LIF) detection schemes were developed to analyze cyanobacteria according to 1) the separation and quantitation of their natively fluorescent phycobiliproteins, and 2) their electrophoretic profiles as …
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Three-Dimensional Microscopy by Laser Scanning and Multi-Wavelength Digital Holography
… presented. The method, based on the simultaneous dual-wavelength digital holography, allows for higher axial range at which the unambiguous phase imaging can be performed. The technique is capable of nanometer axial resolution. The noise level, which increases as a result of using two wavelengths, …
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Polarization-Maintaining Fiber-Based Optical Coherence Tomography on Functional Imaging in Dense Nerve
… (neural activity) of pike olfactory nerve. A dual-wavelength polarization-sensitive spectral-domain OCT system has been designed and constructed in house for depth-resolved optical recordings. The olfactory nerves dissected from pike were used with or without voltage-sensitive dye staining. …
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An investigation of remote non-contact photoplethysmography and pulse oximetry
… metal oxide semiconductor (CMOS) camera and a dual wavelength array of light emitting diodes (LEDs) (760 nm and 880 nm). By alternately illuminating a region of tissue with each wavelength of light and detecting the backscattered light with the camera at a rate of 16 frames per second per …
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A multimodal breast cancer imaging system using coregistered dynamic diffuse optical tomography and digital breast tomosynthesis
… (FD-NIRS) component. It achieves simultaneous dual wavelength operation at 685 nm and 830 nm by concurrent 67.5 MHz and 75 MHz frequency modulation of each laser source, respectively, followed by digitization using a high-speed analog to digital converter and real-time hybrid FPGA-assisted …
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