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 59 for “"high brightness"”.
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High-brightness diode-pumped waveguide lasers
Reported in this thesis are advances toward high-brightness diode-pumped planar waveguide (PW) lasers. Efficient and compact planar waveguide lasers are made possible by their geometry, which is compatible with that of high-power diode lasers, has very good thermal management characteristics, and …
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Generation, transport and focusing of high-brightness heavy ion beams
… and determines the final spot size of a high intensity ion beam on a scaled version of a Heavy Ion Fusion driver. The final spot size is determined by the conditions of the beam produced in the injector, the beam dynamics in the focusing lattice, and the plasma neutralization dynamics in …
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High-brightness electron beams from a DC, high-voltage, GaAs photoemission gun
We have built a high-DC-voltage GaAs photoemission gun and used it to measure the rms transverse emittance and rms momentum spread of the highly-charged, short-duration electron bunches it generates. We report these measurements as functions of microbunch charge for different beam radii, pulse …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
… the same power factor condition, thus achieving higher efficiency. Instead of using an electrolytic capacitor for the filter, a polyester capacitor of better lifetime expectancy is used. An interleaved power factor correction SEPIC with valley fill circuit is proposed to further increase the …
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Experimental investigation of the emission of high-brightness extreme ultraviolet radiation from laser-plasma interactions
… that of light. Electrons can gain a sufficiently high longitudinal velocity on reaching the back of the accelerating structure to become trapped inside it. These injected electrons then “surf” the plasma wave to reach energies that can exceed several GeV on the centimetre scale. This enables …
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BEAM COMBINING OF FIBER LASERS AND VERTICAL EXTERNAL CAVITY SURFACE EMITTING LASERS USING VOLUME BRAGG GRATINGS
Advances in high brightness laser sources with near diffraction limited beam quality outputs have enabled wide range of applications. However, physical constraints such as material heating and nonlinear effects limit the maximum achievable power of these laser sources. In order to obtain higher …
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Design and testing of an electron cyclotron resonance heating ion source for use in high field compact superconducting cyclotrons
… evaluate the feasibility of axial injection of a high brightness beam from an Electron Cyclotron Resonance ion source into a high magnetic field cyclotron. Axial injection from an ion source with high brightness is important to reduce particle losses in the first several turns of acceleration …
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White light emitting diode as liquid crystal display backlight
The discovery of high brightness (white) light emitting diode (LED) is considered as a real threat to the current lighting industry in various applications. One of the most promising sectors would be using white LED to replace the current Cold Cathode Fluorescent Light (CCFL) technology as the …
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High Power Sources Near 0.9 Micrometers in *Oxide Glass Fibers
The development of efficient, high-brightness sources near 0.9 mum has not been successful to date. Optical fibers doped with neodymium offer a promising approach to the realization of this wavelength region. This thesis investigates the feasibility of using the 4F3/2 → 4I9/2 transition in …
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Low emittance electron beam production and characterization with a 17 GHz photocathode RF gun
… experimental results of the production of very high brightness electron beams using a 17 GHz photocathode RF gun. A beam brightness of up to 8x 1013 A/([pi]m rad)2 was measured for a 1 MeV, 1 ps, 50 pC electron bunch. Such high brightness beams are critically important as injectors for linear …
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Charges and Excitons in Organic and Pervoskite Light Emitting Materials and Devices
… is essential to simultaneously achieving high brightness and high efficiency. In DC-driven OLEDs, this is relatively straight forward. However, in the newly emerging, capacitive, field-activated AC-driven organic devices, charge balance can be a challenge. We introduced the concept of …
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The use of ionic liquid ion sources (ILIS) in FIB applications
A new monoenergetic, high-brightness ion source can be constructed using an arrangement similar to liquid metal ion sources (LMIS) by substituting the liquid metal with an ionic liquid, or room temperature molten salt. Ion beams produced by these ionic liquid ion sources (ILIS) have energy deficits …
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Commercialization of Quantum Dot White Light Emitting Diode technology
It is well known that the use of high-brightness LEDs for illumination has the potential to substitute conventional lighting and revolutionize the lighting industry over the next 10 to 20 years. However, successful penetration of this extremely large lighting market would require vast improvements …
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Development of optical field emitter arrays
… and compact X-ray sources require low emittance, high brightness and short duration electron bunches that form a periodic pattern in the transverse plane. This thesis theoretically developed optical field emitter arrays that are suitable for use as the electron source for this novel X-ray source. …
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Investigation of Microbunching Instabilities in Modern Recirculating Accelerators
… to both accelerate and preserve the beam with high beam quality, as well as efficiently reuse the accelerating components. As modern accelerators push toward the high-brightness or high-intensity frontier by demanding particles in a highly charged bunch to concentrate in an ever-decreasing beam …
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CORRELATED PHOTON PAIRS AND MULTIPHOTON STATES FROM A COLD ATOMIC ENSEMBLE
… the realization and characterization of a high-brightness, temporally correlated photon-pair source at near-resonant wavelengths of 780 nm and 795 nm in an optically dense cold <sup>87</sup>Rb ensemble. The source is based on a spontaneous four-wave mixing process implemented in a …
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Analysis and applications of coupled leaky-mode, implant-defined surface-emitting laser arrays
… free-space and fiber-based optical links, high-power laser pumps, and optical imaging. Coherently coupled arrays exhibit desirable characteristics such as low beam divergence and high brightness. However, the fabrication procedures necessary for such designs are typically complicated and …
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Process development and fabrication of photonic crystal based III-V semiconductor optical sources
… in such applications as facial recognition and high-speed data transmission for which efficient operation in single mode emission is desired. Vertical Cavity Surface Emitting Laser (VCSEL) diodes are at the forefront for these applications and there has been significant development in VCSEL …
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Analysis of Fabry-Pérot laser resonators stabilized by microlenses and applications in speckle-free imaging
… the array or to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this resonator very closely matches theoretical results calculated with standard Gaussian optics as well as numerical Rayleigh-Sommerfeld diffraction results. It was found that the …
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Advanced Integration of Devices Enabled by Laser Crystallization of Silicon
The push for higher levels of performance drives research and innovation in all areas of electronics. Thus far, shrinking circuit sizes and development of new material systems have satisfied this need. Continued scaling and material improvements have become increasingly difficult; simultaneously, …
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