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The room-temperature intracavity difference-frequency generation in mid-infrared spectral range have been observed in a butt-joint GaAs/InGaAs/InGaP quantum-well laser diode which supports lasing at two closely spaced wavelengths in the near-infrared range. A special asymmetric waveguide design and a low-doped substrate that minimize mid infrared losses and realize phase matching condition for the...
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