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Proceedings Paper

Controlled intermixing of multiple quantum wells for broadly tunable integrated lasers
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Paper Abstract

A broadly tunable MQW laser utilizing a combined impurity-free vacancy disordering and beam steering techniques is proposed and investigated experimentally. The device consists of a beam-steering section and an optical amplifier section fabricated on a GaAs/AlGaAs MQW p-i-n hetrostructure substrate. The beam steering section forms a reconfigurable single mode waveguide that can be positioned laterally by applying electrical currents to two parallel contact stripes. The active core of the gain section contains a GaAs/AlGaAs MQW that is progressively disordered such that an optical beam steered through the selected region experience a peak in the gain spectrum that is determined by the degree of disordering of the MQWs. Furthermore the MQW in the beam-steering section is disordered to the largest extent to minimize optical beam attenuation. The MQW structure was intermixed using an impurity-free vacancy induced disordering technique. The MQW sample is encapsulated with a SiO2 film grown by plasma enhanced chemical vapor deposition (PECVD). The beam steering region is coated with a 400nm thick SiO2 film whereas in the gain section, the SiO2 film is selectively etched such that the thickness grades linearly ranging from 0 to 325nm. The disordering of the entire slab region is then induced by a single rapid thermal annealing step at 975°C for a 20s. Experimental results showed a controllable 10 to 60 nm wavelength blue shift of the peak of the photoluminescence spectrum corresponding to the change in SiO2 caps thickness and a lateral beam steering range up to 20 μm over the slab region.

Paper Details

Date Published: 16 February 2011
PDF: 7 pages
Proc. SPIE 7953, Novel In-Plane Semiconductor Lasers X, 79531Y (16 February 2011); doi: 10.1117/12.873579
Show Author Affiliations
Abdullah J. Zakariya, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Univ. of Central Florida (United States)
Information Technology & Communication Sector, MOI-Kuwait (Kuwait)
Nathan Bickel, Univ. of Central Florida (United States)
Patrick LiKamWa, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 7953:
Novel In-Plane Semiconductor Lasers X
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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