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METALORGANIC MOLECULAR BEAM EPITAXY (MOMBE) IS A SEMICONDUCTOR GROWTH TECHNIQUE THAT HAS THE POTENTIAL FOR COMBINING THE BEST FEATURES OF MOLECULAR BEAM EPITAXY WITH THOSE OF ORGANOMETALLIC VAPOR PHASE EPITAXY (OMVPE). A MAJOR PROBLEM HINDERING DEVELOPMENT OF MOMBE TECHNIQUES FOR GROWING GROUP III/V SEMICONDUCTORS IS THE AVAILABILITY OF APPROPRIATELY DESIGNED SOURCE REAGENTS THAT PERMIT EFFICIENT ...

FERROELECTRIC MATERIALS SUCH AS BARIUM TITANIUM OXID (BARIO3) HAVE ELECTRO-OPTIC COEFFICIENTS THAT ARE AN ORDER OF MAGNITUDE GREATER THAN THAT OF THE MORE COMMON LITHIUM NIOBIUM OXIDE (LINBO3). THEIR SUPERIOR POTENTIAL HAS NOT BEEN EXPLOITED BECAUSE THE ROUTINE GROWTH OF LARGE DEFECT-FREE OPTICAL QUALITY CRYSTALS HAS NOT BEEN ACHIEVED. IN THIS INVESTIGATION, PLANAR WAVEGUIDES ARE BEING FABRICATED ...

OVER THE PAST DECADE STUDIES HAVE INDICATED THAT IT IS POSSIBLE TO UTILIZE THE ULTRAFAST (PICOSECOND) RESPONSE TIMEOF A PHOTOCONDUCTOR TO DETECT AND TIME RESOLVE THE RAPID VARIATIONS OF LIGHT FROM A RAPIDLY CHANGING SOURCE SUCH AS APULSED LASER, A LASER FUSION EXPERIMENT, A DIRECTED ENERGY WEAPON OR A NUCLEAR WEAPONS EXPLOSION. IN ADDITION TO THE RAPID TEMPORAL EVOLUTION OF THE LIGHT OUTPUT FROM S ...

HIGH-DENSITY ENERGY STORAGE AND FAST DISCHARGE WILL BE CRITICAL IN A VARIETY OF HIGH POWER AEROSPACE APPLICATIONS. CAPACITORS ARE IDEAL FOR THESE PURPOSES, AS WELL AS FOR POWER CONDITIONING AND FILTERING. UNFORTUNATELY, BULK POWDER-BASED DIELECTRICS USED IN CAPACITORS HAVE SEVERE LIMITATIONS, ESPECIALLY THE HIGH NUMBER OF SHORT-INDUCING DEFECTS CAUSED BY POOR CONTROL OF MATERIAL PROPERTIES IN CERA ...

A RENEWED INTEREST IN THE APPLICATIONS OF SUPERCONDUCTIVITY HAS RESULTED FROM THE RECENT DISCOVERY OF PEROVSKITE-LIKE COPPER-OXIDE SUPERCONDUCTORS WITH TRANSITION TEMPERATURES ABOVE LIQUID NITROGEN TEMPERATURES. ALTHOUGH THE THIN FILMS AS DEPOSITED GENERALLY HAVE THE APPROPRIATE Y:BA:CU STOICHIOMETRY, A SUBSEQUENT HIGH TEMPERATURE (T>900 DEGREE CELCIUS) OXYGEN TREATMENT IS REQUIRED TO ACHIEVE THE ...

NEW MATERIALS ARE NEEDED FOR SPACE-BORNE PRECISION OPTICAL COMPONENTS AND THERMO-MECHANICALLY STABLE, LARGE LIGHTWEIGHT STRUCTURES. THE OPPRTUNITY EXISTS FOR FABRICATING BOTH OPTICAL COMPONENTS AND SUPPORT-ING STRUCTURES WITH MATERIALS OF THE SAME CHEMICAL COMPOSITION. CALCIUM-ZIRCONIUM-PHOSPHATE (CZP) CERAMICS ARE BEING EXPLORED FOR POSSIBLE USE IN THE FABRICATION OF SPACE-BORNE STRUCTURAL AS WEL ...

THIS STUDY INVESTIGATES A CONCEPT FOR IMPROVING THE AVERAGE POWER OF RADAR QUALITY CO2 TRANSMITTERS. DEFENSE APPLICATIONS INCLUDE LASER RADARS AND REMOTE SENSING. COMMERCIAL USES ARE INDUSTRIAL PROCESSES SUCH AS CUTTING, SCRIBING, AND MARKING, AS WELL AS REMOTE SENSING.

An innovative discharge geometry for a very compact, area cooled, high average power CO2 laser employing a two mirror, waveguide-stable optical cavity is proposed. The specific Phase I result sought is the generation of an average CO2 output power of 1 W/cm2 of wall cooling area in a geometry that has a total cooling area of 140 cm2. A lightweight CO2 amplifier version of a future Phase II devic ...

THE CHEMICAL MECHANISMS OF CHEMICAL VAPOR DEPOSITION (CVD) OF DIAMOND AND OTHER ELECTRONIC MATERIALS ARE AT BEST POORLYUNDERSTOOD. DURING PHASE I, WE SHALL CONSTRUCT A LOW PRESSURE CHEMICAL VAPOR DEPOSITION (LPCVD) REACTOR EQUIPPED WITH AN ION BEAM SURFACE PROBE AND DEMONSTRATE ITS UTILITY IN DETERMINING SURFACE STOICHIOMETRIES UNDER ACTUAL DEPOSITION CONDITIONS IN-SITU. THE GOAL IS TO PERFECT AND ...

THE EFFECTIVENESS OF KINETIC ENERGY SPACE-BASED INTERCEPTOR MAY BE CONSIDERABLY ENHANCED BY ON-BOARD UV SENSORS CAPABLE OF DETECTING A POTENTIAL TARGET'S UV SIGNATURE. SUCH UV SENSORS MAY PLAY A CRITICAL ROLE IN TARGET IDENTIFICATION, TRACKING, SEEKING AND DISCRIMINATION AND MAY PROVE INSTRUMENTAL FOR EARLY WARNING OF ATTACK AND KILL DETERMINATION. SPACE-BASED APPLICATIONS, IN PARTICULAR, HAVE CRE ...