TSFPI is comprised of two semi-transparent parallel silicon mirrors, one of those is mounted on a motor-driven linear actuator. Measuring of THz radiation parameters is performed by means of translation (scanning) of the moving mirror as shown in fig. 1.

THz Scanning Fabry-Perot Interferometer is also capable of measuring wavelength and intensity of wideband THz sources, as well as filtering THz radiation as per Fabry-Perot interferometer transmission spectrum (fig. 2).

TSFPI supports many mirror translation modes, such as moving the mirror into a given position, shifting the mirror for a given distance, continuous and cyclic translation. Mirror translation speed, interval between shifts, starting and ending positions can be adjusted as well.

TSFPI package includes the following:

 TSFPI interferometer unit;

 Power supply and control unit;

 Mirror translation control software;

 Cables;

 User guide.

Following accessories for the TSFPI can be supplied separately:

 Optoacoustic Golay Detector GC-1P/T/D;

 BPF (band-pass filters) for a specified wavelength within 0.1-15 THz range;

 LPF (low pass filters) to filter out IR radiation, with the following cut-off frequencies: 23.4 THz, 23.3 THz, 23.1 THz, 14.3 THz, 10.9 THz, 8.8 THz, 5.5 THz, 4.3 THz, 4 THz, 3.2 THz;

 A set of attenuators with 1%, 3%, 10% and 30% transmittance;

 TPX and HRFZ-Si lenses.