Generation and measurement of traceable THz frequencies

We present different methods and preliminary results for establishing frequency traceability of continuous wave (CW) terahertz (THz) radiation in the 50 - 1'200 GHz range to a high level of precision and accuracy. The THz radiation is generated by photomixing two telecom lasers and the frequency traceability is achieved either by measuring the laser frequencies with a traceable wavemeter or by directly referencing the two lasers to a self-referenced optical frequency comb (OFC) locked to an atomic clock. This method will allow achieving a relative THz frequency uncertainty below 8·10
^-9
.