and, since 1976, on electncaf packaging analysis. He has "been awarded five US patents. Computer Analysis of Dielectric Waveguides: A Finite-Difference M[ethod EDGARD SCHWEIG, hlH?f13ER,IEEE, AND WILLIAM B. BRIDGES, FELLOW, IEEE .&tract-A method for computing the modes of diel~tric guiding structures based on finite differences is described. The numerrcaf computation program is efficient and can be applied to a wide range of problems. We report here solutions for circular and rectangular dielectric waveguides and compare our solutions with those obtained by other methods. Limitations in the commonly used approximate formulas developed by Marcatili are discussed. I.
We investigate the room-temperature absorption saturation of p-Ge and p-Si for several samples over a range of doping densities for light having wavelengths of 10.6 and 9.6 μm. The transmission data can be fairly well described using an intensity dependent absorption coefficient characteristic of an inhomogeneously broadened two-level system. Measurements of the saturation intensity of p-Ge show that Is increases monotonically with increasing hole concentration, and that the resonant transition is significantly easier to saturate in p-Ge than in p-Si for the samples we examined.
The dielectric constants and loss tangents of KRS-5 and KRS-6 thallium halide mixed crystals have been measured at 95 GHz using both the shorted wavegnide (SWG) reflection method and the Fabry-Perot (F-P) transmission method on samples filfing standard WR-10 waveguide. The results-KRS-S C: = 31, tan8 = 1.8x 10-2; KRS-6 c;= 29, tans = 2 X 10-z-agree reasonably well with a simple theoretical fit to the far-infrared Iatilce absorption of TfBr and TICI centered at about 1400 GHz. The dielectric samples were hot-pressed into copper wafers with dimensions matching WR-10 wavegoide, and then machined and polished to obtain flat, parallel air-dielectric interfaces.
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