Accession Number : ADA294111

Title :   Optical Properties of Lithium Niobate Waveguides, and Prism Coupling for Optimizing Waveguide Fabrication.

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

PDF Url : ADA294111

Report Date : 25 APR 1995

Pagination or Media Count : 210

Abstract : I investigated the accuracy and precision of effective index of refraction measurements using prism coupling. I found that the coupling gap's geometry is critical to predicting the accuracy and resolution of measurements. I provide experimental evidence that there are advantages to using high coupling pressures that yield long coupling lengths. I present and evaluate an experimental technique aimed at reducing the effects of perturbation and find that it may not be applicable to all situations. I extend a previous model of prism coupling to include a finite coupling length. Also, I introduce an alternative model of prism coupling based upon a local normal-mode expansion and present its preliminary numerical results. I have observed more extraordinary polarized guide modes near cut-off in Ti in-diffused lithium niobate planar waveguides than are predicted by Ti in-diffusion models. I also observe these nearly cut-off modes in lithium niobate specimens fabricated without Ti under a variety of diffusion atmospheres. Values of the effective index of these nearly cut-off modes found do not agree with those calculated. jg

Descriptors :   *COUPLING(INTERACTION), *OPTICAL PROPERTIES, *WAVEGUIDES, *LITHIUM NIOBATES, *PRISMS(OPTICS), MEASUREMENT, POLARIZATION, OPTIMIZATION, MODELS, RESOLUTION, NUMERICAL ANALYSIS, REFRACTIVE INDEX, THESES, FABRICATION, HIGH PRESSURE, LENGTH, LABORATORY PROCEDURES, TITANIUM, EXPANSION, DIFFUSION, REFRACTION, ATMOSPHERES, NORMALITY.

Subject Categories : Electrical and Electronic Equipment
      Inorganic Chemistry
      Mfg & Industrial Eng & Control of Product Sys
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE