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Proceedings Paper

Optimization strategies for diode cascade InGaAs VCSELs
Author(s): Matthias Golling; T. Knoedl; Axel Straub; Max Kicherer; Karl Joachim Ebeling
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Paper Abstract

We present top surface emitting two- and three-stage bipolar cascade vertical cavity surface emitting lasers (VCSELs) for continuous wave (cw) operation at room temperature. The results are compared with a conventional VCSEL grown under identical growth conditions for reference. The improvement of both threshold current density and differential quantum efficiency can be clearly shown in structures with unchanged top mirror reflectivities (19 pairs). To further increase the differential quantum efficiency, a device with only 14 p-type top mirror pairs is fabricated, yielding an efficiency of 130% for cw room temperature operation. From noise measurements, we extract a modulation efficiency of 8.2 GHz/sqrt(mA}, indicating favorable dynamic properties of these VCSEL.

Paper Details

Date Published: 4 May 2001
PDF: 7 pages
Proc. SPIE 4286, Vertical-Cavity Surface-Emitting Lasers V, (4 May 2001); doi: 10.1117/12.424795
Show Author Affiliations
Matthias Golling, Univ. of Ulm (Germany)
T. Knoedl, Univ. of Ulm (Germany)
Axel Straub, Univ. of Ulm (Germany)
Max Kicherer, Univ. of Ulm (Germany)
Karl Joachim Ebeling, Univ. of Ulm (Germany)


Published in SPIE Proceedings Vol. 4286:
Vertical-Cavity Surface-Emitting Lasers V
Kent D. Choquette; Chun Lei, Editor(s)

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