R. Czarny, M. Alouini, X. Marcadet, S. Bansropun, J. Doualan, R. Moncorgé, J. Lampin, M. Krakowski, D. Dolfi
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Continuous wave THz generation based on a dual-frequency laser and a LTG - InGaAs photomixer
We demonstrate a high-spectral-purity continuous-wave terahertz source, using a diode pumped Yb3+:CaF2 dual frequency laser. THz radiation is generated by photomixing the two frequencies in a low-temperature grown In0.23Ga0.77As photoconductor, doped with Be, and loading a spiral antenna. The frequency difference between the two optical modes is tuneable by step from d.c. to 2 THz. A maximum laser power of 215 mW CW has been obtained with a beatnote-linewidth narrower than 30 kHz. Measurements show a tuneable THz emission with a maximum output power in the order of few tens nW
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