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Optical Engineering

Novel concepts for injection lasers
Author(s): Nikolai N. Ledentsov; Vitaly A. Shchukin
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Paper Abstract

Modern trends in the design of semiconductor lasers are addressed. Nanoscale coherent inclusions of a narrower bandgap semiconductor in a wider gap semiconductor matrix, or quantum dots (QDs), are designed as a new type of active medium for injection lasers. QDs provide a possibility to extend the wavelength range of heterostructure lasers on GaAs substrates to 1.3 μm and beyond and improve their device performance. We realize 330-mW cw 1.3-μm single-mode continuous wave edge emitters and 1.2-mW cw vertical-cavity surface-emitting lasers (VCSELs). Long operation lifetimes and other competitive device parameters are demonstrated. Novel device designs are proposed. In one concept, high-order mode filtering in structures with periodically modulated refractive index containing a "defect" enables realization of stable narrow-beam divergence fundamental mode lasing in both edge emitters and VCSELs. In a different novel design, light propagates at some angle with respect to multilayer interference reflectors (MIRs), and the MIRs and the cavity are calculated for the tilted photon incidence. A "tilted cavity" laser (TCL) gives wavelength-stabilized operation in edge and (or) in surface direction and does not require materials having a high refractive index difference. New generations of semiconductor optical amplifiers, photodetectors, optical fibers, etc. may become a reality.

Paper Details

Date Published: 1 December 2002
PDF: 11 pages
Opt. Eng. 41(12) doi: 10.1117/1.1518677
Published in: Optical Engineering Volume 41, Issue 12
Show Author Affiliations
Nikolai N. Ledentsov, Technische Univ. Berlin (Germany)
Vitaly A. Shchukin, Technische Univ. Berlin (Germany)

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