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We report on the first direct measurement of the emission character ofquantum cascade laser based frequency combs, using intensity autocorrelation.The correlation technique is based on fast electro-optic sampling, with abandwidth optimized to match the emission spectra of the comb laser, centeredaround 2.5~THz. We find the output light to be amplitude and frequencymodulated at the same time, with intensity modulation depth as high as 90\%,occuring on timescales as short as few picoseconds. We compare these findingswith intensity autocorrelation measurements of pulsed Terahertz lightoriginating from a photoconductive antenna and find very different results. Weobserve no significant difference for the comb and dispersed regime. Thetechnique will be of significant importance in future for the measurement ofultra-short pulses from quantum cascade lasers.

Intensity autocorrelation measurements of quantum cascade laser frequency combs in the Terahertz range