Imperial College London

Professor WE (Bill) Lee FREng

Faculty of EngineeringInstitute for Security Science & Technology

Co-Director of Institute for Security Science and Technology
 
 
 
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Contact

 

+44 (0)20 7594 6733w.e.lee Website

 
 
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Assistant

 

Ms Denise McGurk +44 (0)20 7594 8864

 
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Location

 

Central LibrarySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

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.

Journal article

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

Journal article

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

Journal article

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

Journal article

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.

Journal article

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

Journal article

Lee WE, Lagerlof KPD, Mitchell TE, Heuer AHet 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.

Journal article

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

Journal article

LEE WE, LAGERLOF KPD, MITCHELL TE, HEUER AHet 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

Journal article

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

Journal article

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

Journal article

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