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It is shown that the mid/far-infrared (IR) and THz pulse generation via intracavity difference-frequency mixing in quantum-well dual-wavelength heterolasers can be rather efficient under mode-locking regime for one or both lasing fields even at room temperature. In a simple model we derive an explicit formula for intensity of the generated IR or THz pulse and find that this method is capable of producing picosecond pulses at approximate to 1 GHz repetition rate with the peak power of the order of 1 W and <= 0.2 mW at 10 mu m and 50 mu m wavelengths, respectively.

Mode-Locked Dual-Wavelength Heterolasers for Terahertz Generation via Intracavity Wave Mixing