Abstract
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.
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