Figure 5
From: Laser diode based THz-TDS system with 133 dB peak signal-to-noise ratio at 100 GHz
In (a) we show raw measurement data of the terahertz and interferometer signal in blue and orange respectively. Both signals are measured in parallel using the LIA. While the terahertz signal is measured via the implemented lock-in procedure, the interferometer signal is measured using a standard auxiliary port. A magnification of the interferometer signal in blue is depicted in (b) and compared with the theoretical solution calculated with Eq. 10 in orange. An additional inset shows a further magnification, highlighting the high-frequency fringes of the interferometer signal.
