ASOCIATIVIDAD 65

Each technique described in this chapter has been outlined and its suitability with respect to the measurement of dispersion in challenging samples. The per- tinent question is which of these techniques are best suited to the investigation of low transmission, highly dispersive devices using a pulse source.

Full pulse characterisation techniques are designed to analyse unreferenced pulses and as such are suited to high incident peak intensities. Their sole disadvantage,namely comparatively low sensitivity is not a factor when con- sideration is given to their optimal role; to fully define a pulse which will later serve as a reference for a spectral interferometry technique. Whether the com- plexity, cost and time required to arrange such a setup are justified depend on the priorities of the experimentalist.

Autocorrelations are ubiquitous for a good reason; while they offer lim- ited information, they are easy (and comparatively inexpensive) to arrange, can deliver data in real time and are compact. As a precursor to a more ad- vanced technique and as everyday tools for diagnosis of a laser system they are extremely valuable, but can never measure dispersion quantitatively.

Spectral interferometry can boast the highest sensitivities and quickly de- liver detailed phase information, fully characterising a transfer function. No pulse information can be extracted by SI alone, either it can be used as a complementary technique to full pulse characterisation or pulses can be partly defined by simple measurements such as autocorrelation and spectrum.

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