THz Time Delay and FFT Phase

Move the THz pulse in time and observe how the spectral phase slope changes. The FFT amplitude and unwrapped phase are calculated directly from the time-domain electric field. Reflection amplitude and delay can also be varied.

Pulse duration

Characteristic frequency

Main pulse delay

Translate the complete THz pulse in time.

Reflection amplitude

Relative amplitude of the reflected THz pulse.

Reflection delay

Temporal separation between the main pulse and reflection.

Time-domain THz electric field

Fixed time window: −10 ps to +10 ps.

FFT amplitude

Normalized spectral amplitude.

FFT phase

Unwrapped phase referenced to zero at the first meaningful spectral frequency.

Measured slope: —
Expected shift contribution: —

Applied main delay —

Main peak time —

Phase slope —

Delay from phase slope —