High Temperature Oxidation of Nickel at 1373 K in CO - CO 2 - O 2 Atmospheres and Morphology Analysis on Scales

Schottky barrier and oxide-restricted ridge-waveguide large optical cavity (LOC) arrays were fabricated and tested. Both evanescently coupled and diffraction-coupled array geometries were evaluated in terms of lateral and transverse mode behavior. The array stripes were 3 microns wide, with a separation of 4.5, 6, 7.5 and 9 microns from center to center. Peak powers of over 2 W were obtained for 11-element devices, with typical threshold currents in the range of 20-25 mA/stripe and differential quantum efficiencies of more than 60 percent. Single-lobe lateral far-field patterns were obtained for evanescently coupled arrays with a center-to-center stripe spacing of 4.5 microns and for diffraction-coupled arrays with a center-to-center stripe spacing of 6 microns and with 30-micron-long diffraction regions. The transverse-mode behavior was investigated as a function of the guiding layer width.