Cerenkov-type phase-matched second-harmonic emission from GaAs/AlGaAs quantum-cascade lasers

Journal Article · Mon Mar 17 00:00:00 EDT 2008 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2901021· OSTI ID:21120607

Austerer, M; Detz, H; Schartner, S; Nobile, M; Schrenk, W; Andrews, A M; Klang, P ^[1]; Strasser, G ^[2]

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1. Center for Micro- and Nanostructures, TU Vienna, Floragasse 7, A-1040 Vienna (Austria)
2. Departments of Electrical Engineering and Physics, SUNY at Buffalo, New York 14260 (United States)

Second-harmonic (SH) emission in the form of Cerenkov-type phase-matched radiation has been measured for quantum-cascade lasers (QCLs) with built-in nonlinearities. The QCLs operate at 10.9 {mu}m wavelength and, due to material dispersion, show a high collinear phase mismatch, resulting in low SH external conversion efficiencies on the order of 2 {mu}W/W{sup 2}. Due to our waveguide design, we were able to couple out and measure the generated SH light in the form of Cerenkov-type phase-matched radiation from the substrate of the device. The SH power collected from the Cerenkov beam leads to an increased external conversion efficiency of {approx}50 {mu}W/W{sup 2}.

• OSTI ID: 21120607
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 92; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM ARSENIDES
CHERENKOV RADIATION
EFFICIENCY
EXTERNAL CONVERSION
GALLIUM ARSENIDES
HARMONIC GENERATION
LASERS
NONLINEAR OPTICS
OPTICAL DISPERSION
SEMICONDUCTOR MATERIALS
SUBSTRATES
WAVEGUIDES
WAVELENGTHS