Infrared (IR) pulses as short as 130 fsec are generated by using semiconductors switching. Such pulses contain only ~4 optical cycles, the shortest ever achieved in the midinfrared. The measured power spectrum (7.5–10.5−μm base width) is consistent with the Fourier transform of the IR pulse.
© 1986 Optical Society of America
Claude Rolland and P. B. Corkum, "Generation of 130-fsec midinfrared pulses," J. Opt. Soc. Am. B 3, 1625-1629 (1986)