A method and a system for single-shot multi-frame ultrafast terahertz imaging of a scene, the method comprising generating a pump beam and a probe beam: generating a THz beam from the pump beam and passing the THz beam through the scene: multiplexing the probe beam in the time domain and in the spatial-frequency domain, yielding a multiplexed probe beam; detecting a THz beam passing through the scene; guiding the multiplexed probe beam to a THz detection crystal and converting the multiplexed probe beam into mutually orthogonal linear polarized beams; guiding the mutually orthogonal linear polarized beams to a camera; and recovering frames of the scene from multiplexed images acquired by the camera.

A wavelength dispersion measurement apparatus includes a light source, a light pulse train generation unit, an optical amplifier, a measurement unit, a computing unit, a spectrometer, and a control unit. The light pulse train generation unit generates a light pulse train including a first light pulse and a second light pulse based on a light pulse output from the light source. The spectrometer measures a spectrum of the light pulse train output from the light pulse train generation unit after passing through the optical amplifier. The control unit controls generation of the light pulse train by the light pulse train generation unit such that a spectrum shape of each of the first light pulse and the second light pulse is symmetric, based on the spectrum measured by the spectrometer.