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Proceedings Paper

Progress in semiconductor ring lasers
Author(s): Peter J. R. Laybourn; Thomas F. Krauss
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Paper Abstract

Recent work on the development of monolithic semiconductor ring lasers is presented. Circular or oval resonant waveguide rings have been demonstrated; the minimum waveguide bend radius dictates the type of guiding structure needed. In very small rings the laser material must be etched through to provide sufficient refractive index contrast and optical guiding; in larger structures weaker guiding using strip loading is adequate, and problems of wall damage and optical scattering can be avoided. However, there may still be residual loss because of the penetration of the guided optical wave above the thinned cladding layer. A fabrication method has been developed to prevent the interaction of the wave with lossy contact metallization. MMI couplers are ideal output devices for larger ring lasers, efficient operation of which has been demonstrated. These laser configurations are also extremely suitable for mode-locked operation; the ring cavity length determines the pulse frequency. Mode-locking at 28 GHz was inferred from the lasing spectrum of a 3.1 mm circumference ring laser, the design of which was modified by the isolation of short lengths of waveguide to form saturable absorbers.

Paper Details

Date Published: 17 March 1995
PDF: 8 pages
Proc. SPIE 2401, Functional Photonic Integrated Circuits, (17 March 1995); doi: 10.1117/12.205023
Show Author Affiliations
Peter J. R. Laybourn, Univ. of Glasgow (United Kingdom)
Thomas F. Krauss, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 2401:
Functional Photonic Integrated Circuits
Mario Nicola Armenise; Ka-Kha Wong, Editor(s)

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