Real-time absolute frequency measurement of CW-THz radiation using dual THz combs induced by a free-running, dual-wavelength, mode-locked fiber laser

Frequency measurement based on dual THz frequency combs of photocarrier (dual PC-THz combs) is a promising method for the real-time measurement of the absolute frequency in CW-THz radiation without the need for cryogenic cooling. However, use of dual femtosecond lasers hinders the practicability of this method. In this paper, we generated dual PC-THz combs using a free-running, dual-wavelength mode-locked fiber laser, and applied the resulting dual PC-THz comb for the real-time monitoring of the absolute frequency in CW-THz radiation.