The chirp of single-cycle microwave fields after interaction with pairs of parallel diffraction gratings is measured in a phase-sensitive terahertz spectrometer. Novel transmission grating pairs recently proposed by Tournois, which combine diffraction and refraction effects, yield an almost linear group delay over a bandwidth that exceeds that of conventional reflection gratings by a factor of ˜3.5. The experimentally measured group delay shows good agreement with theoretical predictions for both types of grating. The applicability of the novel transmission gratings for stretching and compression of 1–2-fs pulses in the optical regime and the limitations set by material dispersion are discussed.
© 1995 Optical Society of America
Jeffrey O. White, Christoph Ludwig, and Jürgen Kuhl, "Response of grating pairs to single-cycle electromagnetic pulses," J. Opt. Soc. Am. B 12, 1687-1694 (1995)