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Proceedings Paper

Technological challenges for CW operation of small-radius semiconductor ring lasers
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Paper Abstract

Theoretical investigation and device measurements are reported to demonstrate the strict fabrication requirements of small diameter shallow etched semiconductor ring lasers. A very accurate control over the dry etching depth is crucial to both minimise the bending losses and achieve very precise control of the coupling ratio in directional couplers. A reactive ion etching process was developed on Aluminium-quaternary wafer structures, showing selectivity greater than 30 between the AlInAs core layer and the InP upper cladding. The process proved very effective in providing a complete and controllable etching of directional couplers with 500nm wide gaps. Assessment on the effect of the bending losses and on the minimum ring radius was performed through characterisation of half ring lasers. A minimum current threshold of 34mA is reported on 150μm ring radius devices emitting at 1300nm.

Paper Details

Date Published: 14 April 2006
PDF: 8 pages
Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61840R (14 April 2006); doi: 10.1117/12.667588
Show Author Affiliations
S. Fürst, Univ. of Glasgow (United Kingdom)
M. Sorel, Univ. of Glasgow (United Kingdom)
A. Scirè, Institut Mediterrani d'Estudis Avançats (Spain)
G. Giuliani, Univ. degli Studi di Pavia (Italy)
S. Yu, Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 6184:
Semiconductor Lasers and Laser Dynamics II
Daan Lenstra; Markus Pessa; Ian H. White, Editor(s)

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