Resonant Second-Order Nonlinear Optical Processes in Quantum Cascade Lasers
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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 micrometer 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 micrometer 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.
author list (cited authors)
Owschimikow, N., Gmachl, C., Belyanin, A., Kocharovsky, V., Sivco, D. L., Colombelli, R., Capasso, F., & Cho, A. Y.
complete list of authors
Owschimikow, Nina||Gmachl, Claire||Belyanin, Alexey||Kocharovsky, Vitaly||Sivco, Deborah L||Colombelli, Raffaele||Capasso, Federico||Cho, Alfred Y