Demonstration of high-brightness-mode propagation in a compound waveguide structure

We demonstrate the existence of an unusual and useful high-brightness guided mode of a multimode AlGaAs/GaAs heterostructure compound slab waveguide. This mode has a narrow near-field single lobe confined to the low-index regions of the waveguide. This mode was selectively probed by optically exciti...

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Bibliographic Details
Published in:	Applied physics letters Vol. 75; no. 2; pp. 169 - 171
Main Authors:	Patchell, J. A., Logue, F. P., O’Gorman, J., Hegarty, J., Usievich, B. A., Sychugov, V. A.
Format:	Journal Article
Language:	English
Published:	12-07-1999
Online Access:	Get full text
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Summary:	We demonstrate the existence of an unusual and useful high-brightness guided mode of a multimode AlGaAs/GaAs heterostructure compound slab waveguide. This mode has a narrow near-field single lobe confined to the low-index regions of the waveguide. This mode was selectively probed by optically exciting quantum wells optimally placed in the waveguide. By pumping in a stripe geometry, lasing is observed above a threshold of 80 kW/cm2 indicating efficient lasing in the highest-order waveguide mode. The near-field emission pattern of the waveguide was imaged to provide a direct measurement of the intensity profile of the higher-order mode.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.124308