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Full-Text Articles in Physics
Cavity Ringdown Spectroscopy In Nitrogen/Oxygen Mixtures In The Presence Of Alpha Radiation, Sidney John Gautrau
Cavity Ringdown Spectroscopy In Nitrogen/Oxygen Mixtures In The Presence Of Alpha Radiation, Sidney John Gautrau
Master's Theses
This research was part of an effort to experimentally validate computational models under development for radiation-induced atmospheric effects. Cavity Ringdown Spectroscopy (CRDS) was used to measure the concentration of chemical products generated as a result of radiation interactions in a controlled atmosphere. Experiments were conducted in a vacuum chamber interfaced with a gas introduction system that controlled the initial atmospheric composition. A quadrupole mass spectrometer and tunable dye laser were integrated to confirm initial atmospheric composition, and provide wavelength flexibility for detecting a variety of chemical products generated by radiation interactions. CRDS measurements were made for ozone production resulting from …
Hybrid Spatiotemporal Coherent Pulse Addition Of A Picosecond Flashlamp-Pumped Ndyag Laser.Pdf, Ahmad Azim
Hybrid Spatiotemporal Coherent Pulse Addition Of A Picosecond Flashlamp-Pumped Ndyag Laser.Pdf, Ahmad Azim
Ahmad Azim
Transmission Of Focused Picosecond Light Pulse Through Multimode Fibers, Yin Cen
Transmission Of Focused Picosecond Light Pulse Through Multimode Fibers, Yin Cen
Dissertations, Theses, and Capstone Projects
This thesis focuses on a technique of delivering spatially focused and temporally compressed picosecond laser pulses through multimode fibers. This study was inspired by recent success in focusing light through optically diffusive media of which multimode fibers were a special case in terms of causing scrambled phase distribution in the transmitted light. The approach involved controlling the phase distribution of incoming beam using a deformable mirror prior to its entry into the multimode fiber in order to achieve constructive interference at selected spots in the output. With phase control, the intensity of the focused light at the output can be …
Divided-Pulse Amplification To The Joule Level.Pdf, Ahmad Azim, Benjamin Webb, Nathan Bodnar, Michael Chini, Lawrence Shah, Martin Richardson
Divided-Pulse Amplification To The Joule Level.Pdf, Ahmad Azim, Benjamin Webb, Nathan Bodnar, Michael Chini, Lawrence Shah, Martin Richardson
Ahmad Azim
Coherent Beam Combining Of Ultrashort Laser Pulses.Pdf, Ahmad Azim
Coherent Beam Combining Of Ultrashort Laser Pulses.Pdf, Ahmad Azim
Ahmad Azim
Coherent Beam Combining Of Ultrashort Laser Pulses, Ahmad Azim
Coherent Beam Combining Of Ultrashort Laser Pulses, Ahmad Azim
Honors Undergraduate Theses
Ultrashort pulsed lasers have become critical to understanding light-matter interactions in new regimes such as generation of attosecond pulses, laser filamentation, and intense relativistic processes. Development of more powerful and energetic ultrafast lasers is required for advancing these fields of study. Several petawatt class systems now exist with more in development to further scale peak power and extend the frontier of ultrafast laser technology. Another relevant solution to the scaling of energy and power of ultrashort pulses is coherent beam combining (CBC). CBC is useful for not only scaling of laser parameters but also to mitigate parasitic nonlinear processes associated …
Shielded Radiography With A Laser-Driven Mev-Energy X-Ray Source, Shouyuan Chen, Grigory V. Golovin, Cameron Miller, Daniel Haden, Sudeep Banerjee, Ping Zhang, Cheng Liu, Jun Zhang, Baozhen Zhao, Shaun Clarke, Sara Pozzi, Donald Umstadter
Shielded Radiography With A Laser-Driven Mev-Energy X-Ray Source, Shouyuan Chen, Grigory V. Golovin, Cameron Miller, Daniel Haden, Sudeep Banerjee, Ping Zhang, Cheng Liu, Jun Zhang, Baozhen Zhao, Shaun Clarke, Sara Pozzi, Donald Umstadter
Donald Umstadter Publications
We report the results of experimental and numerical-simulation studies of shielded radiography using narrowband MeVenergy X-rays from a compact all-laser-driven inverse-Compton-scattering X-ray light source. This recently developed Xray light source is based on a laser-wakefield accelerator with ultra-high-field gradient (GeV/cm). We demonstrate experimentally high-quality radiographic imaging (image contrast of 0.4 and signal-to-noise ratio of 2:1) of a target composed of 8-mm thick depleted uranium shielded by 80-mm thick steel, using a 6-MeV X-ray beam with a spread of 45% (FWHM) and 107 photons in a single shot. The corresponding dose of the X-ray pulse measured in front of the target …