Advances in continuous-wave THz generation

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Abstract
We introduce tow modifications of the technology of optoelectronic continuous-wave THz spectroscopy. The first relates to the optoelectronic generation of cw THz radiation by heterodyne down conversion of two leaser beam. We present a cw Ti:Sapphire laser with a simultaneous output at two independently tunable colors which are used for the mixing process. Two alternative cavity designs, a linear (alpha) - shaped cavity and a ring cavity, have been realized. A comparison with respect to tunability, bandwidth, stability and experimental handling will be given. The second improvement relates to the detection of cw THz radiation. We discuss detection schemes which are based on the electro- optic effect in nonlinear media and employ the concept of quasi-phase matching for the enhancement of the sensitivity.

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