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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 ...

RECENT DEVELOPMENTS IN OPTICAL COMMUNICATION TECHNOLOGY ARE VERY ENCOURAGING FOR THE POTENTIAL OPERATION OF OPTICAL SATELLITE CROSSLINKS. MOST NOTABLE IS THE DEVELOPMENT OF HIGH EFFICIENCY ND:YAG RING LASERS WHICH WOULD BE ATTRACTIVE TRANSMITTERS IF WIDE BANDWIDTH EXTERNAL PHASE MODULATORS COULD BE DEVELOPED. A TRAVELING-WAVE CONFIGURATION GIVES THE MAXIMUM BANDWIDTH FOR ELECTRO-OPTIC MODULATORS. ...

HIGH POWER SEMICONDUCTORS USING SILICON AND GAAS ARE LIMITED TO ENVIRONMENTS THAT ARE LESS THAN 300 DEG C IN TEMPERATURE DUE TO LOW BANDGAPS, LOW BREAKDOWN FIELDS AND LOW THERMAL CONDUCTIVITIES. 3C-SIC(B-SIC) HAS BEEN IDENTIFIED AS A MATERIAL WITH EXCELLENT POTENTIAL TO FULFILL THE REQUIREMENTS OF A HIGH POWER, HIGH TEMPERATURE SEMICONDUCTOR WITH HIGH RADIATION HARDNESS. THE KEY TO DEVELOPING DEVI ...

THE USE OF OPTICAL SYSTEMS IN HIGH SPEED SIGNAL PROCESSING APPLICATIONS IS DESTINED BECAUSE OF THE OVERWHELMING ADVANTAGES OF PARALLEL DATA TRANSMISSION. MANY APPLICATIONS REQUIRE NONLINEAR TRANSFORMATIONS TO BE PERFORMED IN PARALLEL AT HIGH SPEED AND RESOLUTION. THE USE OF ORGANIC MATERIALS WITH LARGE OPTICAL NONLINEARITIES IS PARTICULARLY ATTRACTIVE BECAUSE OF THEIR FAST RESPONSE, BROADBAND TRAN ...

WIDESPREAD APPLICATION OF HIGH PERFORMANCE DEVICES BASED ON III-V, IV-IV, OR DIAMOND COMPOUND SEMICONDUCTORS WILL DEPEND ON THE DEVELOPMENT OF MANUFACTURING METHODS. RECENTLY, DR. MAX YODER OF ONR PROPOSED A RADICALLY NEW GROWTH SEQUENCE APPLICABLE TO THE GROUP IV SEMICONDUCTORS IN GENERAL AND TO DIAMOND IN PARTICULAR. FOR DIAMOND, IT IS ANTICIPATED THAT ALTERNATE INTRODUCTION OF CH4 AND CF4 TO TH ...

SOLID METAL FUELS CAN PROVIDE GREATER THRUST AND FUEL EFFICIENCY THAN LIQUID FUELS. BORON PARTICLES, A MOST ATTRACTIVE SOLID FUEL ON A THERMOCHEMICAL BASIS, IGNITE UPON EXPOSURE TO MOIST AIR AND UNDERGO A RAPID COMBUSTION WITH HIGH VOLUMETRIC HEAT RELEASE. UNFORTUNATELY, THIS REACTION IS SIGNIFICANTLY SLOWED BY IMPURITIES IN THE BORON AND BY THE FORMATION OF OXIDES UPON THE PARTICLE SURFACE DURING ...

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