Phys. Rev. Lett. 90, 043902 (2003) [4 pages]Resonant Second-Order Nonlinear Optical Processes in Quantum Cascade LasersReceived 13 August 2002; published 31 January 2003 We demonstrate an efficient intracavity nonlinear interaction of laser modes in a specially adapted quantum cascade laser. A two-wavelength quantum cascade laser structure emitting at wavelengths of 7.1 and 9.5 μm included cascaded resonant optical intersubband transitions in an intracavity configuration leading to resonantly enhanced sum-frequency and second-harmonic generation at wavelengths of 4.1, 3.6, and 4.7 μm, respectively. Laser peak optical powers of 60 and 80 mW resulted in 30 nW of sum-frequency signal and 10–15 nW of second-harmonic signal, both in good agreement with theoretical calculations. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.043902
DOI:
10.1103/PhysRevLett.90.043902
PACS:
42.65.Wi, 42.55.Px, 78.67.De, 85.35.Be
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