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Full-Text Articles in Physical Sciences and Mathematics
Improve The Low Energy Sensitivity Of The Hawc Observatory, Zhixiang Ren
Improve The Low Energy Sensitivity Of The Hawc Observatory, Zhixiang Ren
Optical Science and Engineering ETDs
The high altitude water cherenkov gamma-ray observatory (HAWC) has been fully operational since March of 2015 in Mexico at 4,100 meters above sea level on the hillside of the Sierra Negra Volcano. It consists of an array of 300 water cherenkov detectors, each equipped with four photo-multiplier tubes. HAWC operates 24-hours per day with a wide field-of-view (FOV, ∼ 2 sr) and a high duty cycle (∼ 95%). These make it a powerful survey and monitoring experiment for mapping the gamma ray sky at very high energies (VHE, 100 GeV to 100 TeV) and to study sources with varying intensities. …
High Power Optically Pumped Semiconductor Lasers For Sodium Guidestar Applications, Shawn W. Hackett
High Power Optically Pumped Semiconductor Lasers For Sodium Guidestar Applications, Shawn W. Hackett
Optical Science and Engineering ETDs
Optically pumped semiconductor lasers (OPSLs) are shown to provide a much more compact and less expensive source for illumination of the sodium layer of the mesosphere for use as a sodium laser guidestar via single and two photon excitation schemes. This represents a revolution in laser guidestar technology as the cost, size, and power requirements for a laser guidestar system are shown to have been decreased by an order of magnitude with guidestar performance shown to be similar to previous sources. Sodium laser guidestar sources for broadband simultaneous illumination of multiple lines are developed and simulated. Simulations are then compared …