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Amplitude and Phase Characterization of Ultrashort Laser Pulses

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Amplitude and Phase Characterization of Ultrashort Laser Pulses

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As a consequence of the time-bandwidth uncertainty principle, ultrashort laser pulses carry significant bandwidth. If the spectral components that fall under the bandwidth of the laser pulse are time coincident (figure 1.1), the pulse is said to be at its transform limit. A transform-limited pulse implies that the pulse duration is minimized.Material properties, such as dispersion, alter the (phase) relationship between the spectral components of light, effectively separating the blue and red components of the pulse in time (figure 1.2). This effect is known as chirp, and for an ultrashort pulse, serves to elongate the pulse in time.

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