401 results found
Lee WE, Sanford NA, Heuer AH, 1986, TEM EXAMINATION OF MICROSTRUCTURES IN LiNbO//3 OPTICAL WAVEGUIDES., Pages: 93-96
The microstructures of proton-exchanged LiNbO//3 and of Ti-diffused LiNbO//3 optical waveguides were examined in the transmission electron microscope (TEM). It was found that TEM examination can be used to study the microstructures of optical waveguides and indicate the types of defect(s) responsible for loss of waveguiding ability.
LEE WE, SANFORD NA, HEUER AH, 1986, DIRECT OBSERVATION OF STRUCTURAL PHASE-CHANGES IN PROTON-EXCHANGED LINBO3 WAVE-GUIDES USING TRANSMISSION ELECTRON-MICROSCOPY, JOURNAL OF APPLIED PHYSICS, Vol: 59, Pages: 2629-2633, ISSN: 0021-8979
MCCOY M, LEE WE, HEUER AH, 1986, CRYSTALLIZATION OF MGO-AL2O3-SIO2-ZRO2 GLASSES, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 69, Pages: 292-296, ISSN: 0002-7820
LEE WE, MITCHELL TE, HEUER AH, 1986, ELECTRON BEAM-INDUCED PHASE-DECOMPOSITION OF CORDIERITE AND ENSTATITE, RADIATION EFFECTS AND DEFECTS IN SOLIDS, Vol: 97, Pages: 115-126, ISSN: 1042-0150
Sanford NA, Lee WE, 1985, Analysis of proton exchanged channel waveguides in LiNbO3, Proceedings of SPIE - The International Society for Optical Engineering, Vol: 578, Pages: 7-11, ISSN: 0277-786X
Channel waveguides fabricated by proton exchange in x-cut plates of LiNbO3have been examined using mode effective indices, secondary-ion mass spectroscopy (SIMS), and transmission electron microscopy (TEM). Effective indices measured over a wavelength range from 480 to 1320nm, and inverted with a step index approximation, reveals the dispersion of the proton exchanged layer. The index Step,∆ne, depends also on the (Cr) diffusion aperture width used to define the channel; the surface ∆nefor 3-5μm wide channels are 5-10% less than for those 10μm and wider for wavelengths above 632nm. Common 5 minute exchange times at 249C in pure benzoic acid were used throughout. Corroborative evidence, using SIMS, shows reduced Li depletion in narrower guides. Finally, TEM analysis of thinned waveguide samples strongly suggest instabilities observed in proton exchanged waveguides is primarily due to dehydration. © 1985 SPIE.
LEE WE, LAGERLOF KPD, 1985, STRUCTURAL AND ELECTRON-DIFFRACTION DATA FOR SAPPHIRE (ALPHA-AL2O3), JOURNAL OF ELECTRON MICROSCOPY TECHNIQUE, Vol: 2, Pages: 247-258, ISSN: 0741-0581
Lee WE, Lagerlof KPD, Mitchell TE, et al., 1985, Radiation damage and non-equilibrium phases in Al<inf>2</inf>O<inf>3</inf>, Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties, Vol: 51, Pages: 341-L27, ISSN: 0141-8610
Transmission electron microscopy experiments are reported which show that the radiation damage in Al2O3 arises from the recrystallization of a layer of amorphous Al2O3 to yA-Al2O3, and that damage from ion-beam thinning and electron irradiation are related. © 1985 Taylor & Francis Group, LLC.
LEE WE, JENKINS ML, PELLS GP, 1985, THE INFLUENCE OF HELIUM DOPING ON THE DAMAGE MICROSTRUCTURE OF HEAVY-ION IRRADIATED ALPHA-AL2O3, PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, Vol: 51, Pages: 639-659, ISSN: 0141-8610
LEE WE, LAGERLOF KPD, MITCHELL TE, et al., 1985, RADIATION-DAMAGE AND NON-EQUILIBRIUM PHASES IN AL2O3, PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, Vol: 51, Pages: L23-L27, ISSN: 0141-8610
LEE WE, PELLS GP, JENKINS ML, 1984, A TEM STUDY OF HEAVY-ION IRRADIATION DAMAGE IN ALPHA-AL2O3 WITH AND WITHOUT HELIUM DOPING, JOURNAL OF NUCLEAR MATERIALS, Vol: 123, Pages: 1393-1397, ISSN: 0022-3115
LEE WE, HEUER AH, MITCHELL TE, 1984, ELECTRON BEAM-INDUCED PHASE-DECOMPOSITION OF SILICATES, AMERICAN CERAMIC SOCIETY BULLETIN, Vol: 63, Pages: 999-999, ISSN: 0002-7812
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