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Electromagnetic radiation in the mid- to far-infrared spectral rangerepresents an indispensable tool for the study of numerous types of collectiveexcitations in solids and molecules. Short and intense pulses in this THzspectral range are, however, difficult to obtain. While widewavelength-tunability is easily provided by free-electron lasers, the energiesof individual pulses are relatively moderate, on the order of microjoules. Herewe demonstrate a setup that uses cavity-dumping of a free-electron laser toprovide single, picosecond-long pulses in the mid- to far-infrared frequencyrange. The duration of the Fourier-limited pulses can be varied by cavitydetuning, and their energy was shown to exceed 100 {\mu}J. Using theaforementioned infrared pulse as a pump, we have realized a two-colorpump-probe setup facilitating single-shot time-resolved imaging ofmagnetization dynamics. We demonstrate the capabilities of the setup first onthermally-induced demagnetization and magnetic switching of a GdFeCo thin filmand second by showing a single-shot time-resolved detection of resonantphononic switching of the magnetization in a magnetic garnet.

Cavity-Dumping a Single Infrared Pulse from a Free-Electron Laser for Two-Color Pump-Probe Experiments