The goal of this lecture is to be­co­me fa­mi­li­ar with the de­scrip­ti­on and me­a­su­re­ments of ul­tras­hort pul­ses in the time and fre­quen­cy do­main. Learn how ul­tras­hort pul­ses are af­fec­ted by pro­pa­ga­ti­on through li­ne­ar and non­line­ar media.