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.

TSFPI may be used with the following sources:

Gyrotrons;
Optically pumped submillimeter wave lasers;
Backward wave oscillators;
Free-electron lasers;
Difference-frequency THz generators;
Photomixing THz generators;
Quantum cascade lasers;
p-Ge lasers;
Novel THz sources.
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.

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.

Key features:

Wide operating range of the TSFPI, 0.1 – 15 THz;
High breakdown threshold;
Large aperture, 52 mm;
High accuracy of mirror positioning, ±1.25 μm
Easy-to-use.
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.