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Čerenkov-type phase-matched second-harmonic emission from GaAs∕AlGaAs quantum-cascade lasers

Second-harmonic (SH) emission in the form of Čerenkov-type phase-matched radiation has been measured for quantum-cascade lasers (QCLs) with built-in nonlinearities. The QCLs operate at 10.9μm wavelength and, due to material dispersion, show a high collinear phase mismatch, resulting in low SH extern...

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Bibliographic Details
Published in:Applied physics letters 2008-03, Vol.92 (11)
Main Authors: Austerer, M., Detz, H., Schartner, S., Nobile, M., Schrenk, W., Andrews, A. M., Klang, P., Strasser, G.
Format: Article
Language:English
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Summary:Second-harmonic (SH) emission in the form of Čerenkov-type phase-matched radiation has been measured for quantum-cascade lasers (QCLs) with built-in nonlinearities. The QCLs operate at 10.9μm wavelength and, due to material dispersion, show a high collinear phase mismatch, resulting in low SH external conversion efficiencies on the order of 2μW∕W2. Due to our waveguide design, we were able to couple out and measure the generated SH light in the form of Čerenkov-type phase-matched radiation from the substrate of the device. The SH power collected from the Čerenkov beam leads to an increased external conversion efficiency of ∼50μW∕W2.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2901021