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Room temperature single-mode terahertz sources based on intracavity difference-frequency generation in quantum cascade lasers

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5 Author(s)
Lu, Q. Y. ; Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA ; Bandyopadhyay, N. ; Slivken, S. ; Bai, Y.
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We demonstrate room temperature single-mode THz emission at 4 THz based on intracavity difference-frequency generation from mid-infrared dual-wavelength quantum cascade lasers. An integrated dual-period distributed feedback grating is defined on the cap layer to purify both mid-infrared pumping wavelengths and in turn the THz spectra. Single mode operation of the pumping wavelengths results in a single-mode THz operation with a narrow linewidth of 6.6 GHz. A maximum THz power of 8.5 μW with a power conversion efficiency of 10 μW/W2 is obtained at room temperature.

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Applied Physics Letters  (Volume:99 ,  Issue: 13 )