Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 2: Symposium THz-quantum cascade lasers

HL 2.4: Fachvortrag

Monday, March 27, 2006, 11:45–12:15, HSZ 01

Growth and Processing of GaAs quantum cascade lasers — •Gottfried Strasser, Aaron Maxwell Andrews, Tomas Roch, Gernot Fasching, Alexander Benz, Sebastian Golka, Maximilian Austerer, Christian Pfluegl, Werner Schrenk, and Karl Unterrainer — TU Wien, Zentrum für Mikro- und Nanostrukturen, Floragasse 7, 1040 Wien

We report on growth and processing of GaAs-based quantum cascade lasers above and below the reststrahlenband. Despite the advances in mid-infrared (MIR) QCLs, THz QCLs remain difficult to fabricate. The tolerances in alloy composition, layer thickness, and doping are lower for THz QCLs than their MIR counterparts. Processing of GaAs QC lasers at THz frequencies isin spite of the relaxed dimensions, still a demanding task. This is particularly true for micro cavities. Double plasmon waveguides, single plasmon and double metal waveguide scenarios will be discussed. We will report about various THz resonators [1] (circular and ring shaped micro cavities) as well as surface emitting concepts (2nd order dfbs), where smart dfb designs can be used for wavelength selection of e.g. surface SHG [2] versus facet fundamental light output.

[1] G. Fasching, A. Benz, K. Unterrainer, R. Zobl, A.M. Andrews, T. Roch, W. Schrenk, G. Strasser; No-dqTHz Microcavity Quantum Cascade LasersNo-dq; Appl. Phys. Lett. 87, (21.11.2005)

[2] C. Pflügl, M. Austerer, W. Schrenk, G. Strasser; No-dqSecond-harmonic generation in GaAs-based quantum-cascade lasers grown on <100> substratesNo-dq; Electron. Lett., in print (2005)