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We have developed a hot electron bolometer mixer (HEBM) at 3.1 THz with a terahertz quantum cascade laser (THz- QCL) as a local oscillator. Both the HEBM and the THz-QCL device are fabricated in our laboratory. NbN film with 3 nm thickness was deposited on MgO substrate. The output power of the metal-metal waveguide type 3.1 THz-QCL was about 100 W at a heat sink temperature of 15 K. The lowest uncorrected...
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