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Laser technology Assessing the Treatment of Airborne Tactical High Energy Lasers in Combat Simulations This is the full text of a thesis by Maurice C. Azar which was presented to the Air Force Institute of Technology (AFIT) in 2003. In March 2000, the High Energy Laser Executive Review Panel presented the Department of Defense Laser Master Plan, which reported that HEL weapons are ready for offensive and defensive applications. One candidate platform capable of performing some of the reported applications is the Advanced Tactical Laser (ATL), an Advanced Concept Technology Demonstration program which places a high energy laser weapon on a tactical aircraft, such as the V-22, C-130, or H-47. A way of assessing the utility of a new weapon system and the benefits of its inclusion in the force structure is the use of combat models. This research examines, by example, issues involved with modeling an airborne tactical high energy laser weapon in a mission level combat simulation, and evaluates possibilities to aggregate simulation results into higher level, campaign models. [Taken from abstract]. The full text of the thesis is available in PDF format and is provided by the Air University ResearchWeb site. Building Blocks for Time-Resolved Laser Emission in Mid-Infrared Quantum Well Lasers This is a full text thesis by Gabriel D. Mounce which was presented to the Air Force Institute of Technology in 2003. The objective of this research is to improve the performance of mid-infrared semiconductor quantum-well lasers. Lasers operating in the mid-infrared are useful for many Air Force applications which include infrared (IR) countermeasures in particular. Countermeasure applications require lasers that are compact, and able to emit at high powers while operating at room temperature. Limits to power increases are seen in the transverse modal development of laser oscillation. These modes typically form in the wave guiding active region contributing to the laser output. However, competing modes outside of this region also develop when the confining structural layers have the right characteristics. [Taken from abstract]. The full text of the thesis is available in PDF format and is provided by the Air University ResearchWeb site. Characterization of Antimony-Based, Types-I and -II, Multiple Quantum-Well Semiconductor Structures for Mid-Infrared Laser Applications This is the full text on a thesis by Edward G. Ferguson which was presented to the Air Force Institute of Technology (AFIT) in 2003. This experiment characterizes antimony-based, multiple quantum-well, types-I and -II, semiconductor samples designed for laser applications. The samples emit light in the 3-5-µm range to exploit an atmospheric transmission window, making them ideal for infrared (IR)-seeking missiles countermeasures. Photoluminescence (PL) spectra were collected and yielded bandgap (Eg) dependence-on-temperature relationships. The type-I sample was found to follow the Varshni equation, while the type-II samples showed a rise with temperature in a portion of the curve that should be linear according to the Varshni equation. The type-II samples followed the Varshni equation well at higher temperature. The PL study indicated that the type-I sample had better efficiency than the type-II samples, and that there is some change in efficiency with the waveguide nature of the sample. Carrier temperatures (Tc) were derived from the PL study, all the samples for which Tc was derived operated in the optical phonon regime. The PL data was compared to the “FEMB” computer model and some correlation between the two in recombination energy was seen. A time resolved photoluminescence (TRPL) experiment was conducted using the frequency upconversion technique. The experiment clearly found the upconverted signal, but there was a systematic error that prevented any further analysis of the data. [Taken from abstract]. The full text of the thesis is available in PDF format and is provided by the Air University ResearchWeb site. SPIE Digital Library The SPIE Digital Library currently includes more than 268,000 technical papers from SPIE journals and conference proceedings, including full coverage from 1990 to the present. It is possible to both browse tables of contents, and search, and members may full the full text. Non-members can view the bibliographic information and abstracts free of charge. |
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