Abstract
We demonstrate a high-spectral-purity continuous-wave terahertz source, using a diode pumped Yb<sup>3+</sup>:KGd(WO<sub>4</sub>)<sub>2</sub> dual frequency laser. THz radiation is generated by photomixing the two frequencies in a low temperature grown In<sub>:25</sub>Ga<sub>:75</sub>As photoconductor loading a dipole antenna. The frequency difference between the two optical modes is tuneable by step from d.c. to 3.1 THz. A maximum optical output power of 120 mW CW has been obtained with a beatnote-linewidth narrower than 30 kHz. Preliminary measurements show a tunable THz emission with a maximum output power in the order of a few tens of nW.
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