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Silicon has long been the semiconductor of choice for high-voltage power electronic applications. Recently, SiC has attracted attention because SiC is projected to have better performance than silicon. [1] SiC power switching devices have yet to becommercialized, largely due to SiC crystal defects, most notably the device-killing micropipe defect, which does not permit high total current parts t ...

A random access, solid-state, optical cross-switch capable of 770 channel discrimination in the telecommunications C-band is designed and proven as an alternative to current thin-film WDM devices and as a mechanically robust alternative tomicroelectromechanical (MEMS) WDM devices. The device may be used in multiplexing (mux), demultiplexing (demux), or complete cross-switch configurations, and is ...

The wide-bandgap semiconductors GaN and SiC hold great promise for high temperature and highpower electronic devices. This is due to the attractive properties these materials possess, such as wide energy bandgaps, high breakdown fields, high thermalconductivities, and high saturated electron velocities. In addition, GaN and SiC have adequate electron mobilities and can readily be doped n and p ty ...

Programs such as Airborne Laser and Space-Based Laser are in need of highly mass efficient structural materials to achieve system performance targets. This naturally leads to graphite fiber reinforced polymers for many system components. For someapplications, such as cryogen storage vessels, these materials are subject to micro cracking under little or no structural loading. New materials with ...

We propose to develop a prototype suite of recursive partitioning (RP) methodologies to provide advanced warning of failure, malfunction and/or performance degradation for Airborne Laser Program subsystems in service. Through better monitoring and analysisof the status of its systems, prediction of equipment life remaining can be made and corrective action taken to enhance the availability of the ...

Thermal decomposition of hydrogen peroxide may provide significant weight, operability, envelope, and cost benefits over traditional catalytic decomposition units used in propulsion and energy systems. However, no proven methods exist for the design ofreliable and efficient thermal decomposition devices. A validated engineering design model and definition of safe operating regimes are pressing n ...