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Proceedings Paper

Design of high-power surface-emitting DFB lasers for suppression of filamentation
Author(s): Steven H. Macomber
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Paper Abstract

The susceptiblity of curved-grating, surface-emitting, distributed-feedback lasers to filamentation and multi-mode instability was studied by numerical modeling and analysis. It was found that reflections from the ends, edges and output window can intiate instability, leading to filmantation. These effects can be suppressed by using absorbers between the end of the stripe and teh cleaved ends of the chip, wide unpumped-grating edges, and introducing wedge into the substrate to alleviate the effect of window reflections. It was also found that increasing the optical-confinement factor improves stability. A specific design is presented that is stable up to values of antiguiding that is larger than that measured in InGaAs quantum well lasers.

Paper Details

Date Published: 19 June 2003
PDF: 13 pages
Proc. SPIE 4993, High-Power Fiber and Semiconductor Lasers, (19 June 2003); doi: 10.1117/12.479741
Show Author Affiliations
Steven H. Macomber, Spectra-Physics, Inc. (United States)

Published in SPIE Proceedings Vol. 4993:
High-Power Fiber and Semiconductor Lasers
Mahmoud Fallahi; Jerome V. Moloney, Editor(s)

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