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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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Published in: | Applied physics letters 2008-03, Vol.92 (11) |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.2901021 |