Abstract
The design of two tunable quantum cascade laser structures using intracavity phase-matched third harmonic generation is reported. The transverse mode at the lasing wavelength was phase matched with third order transverse mode of the third harmonic signal in one structure and to the fifth order transverse mode in the second structure. The effects of small perturbations in the widths and refractive indices of the waveguide layers are also studied. This analysis yielded optical-waveguide structures capable of generating third harmonic power with a conversion efficiency of about 1mW∕W.
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