Frequency resolved optical gating (FROG) traces of a probe laser pulse under different experimental conditions; the time delay between the pump & the probe pulses is along the vertical axis. The FROG technique is used here to investigate a new method of pulse shortening, molecular phase modulation, which, by controlling the pulse phase, frequency & chirp, can generate laser pulses less than 4 femtoseconds in duration.
From the article:
Generation of Single Intense Short Optical Pulses by Ultrafast Molecular Phase ModulationN. Zhavoronkov and G. Korn
Phys. Rev. Lett. 88, 203901 (2002)
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