Article | REF: E6454 V1

Liquid crystals for ultrafast optics

Author: Aurélie JULLIEN

Publication date: April 10, 2024

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1. Notions of ultrafast optics: spectro-temporal shaping of femtosecond pulses

1.1 Femtosecond pulses

Femtosecond pulses (1 fs = 10 - 15 s) are ultra-short wave packets, characterized by a carrier frequency and an envelope, whose duration is a few tens of optical cycles. Each wave packet corresponds to a continuum of frequencies, or wavelengths, with a particular phase relationship.

As shown in figure 1 , the time profile of the electric field of a pulse of duration

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Notions of ultrafast optics: spectro-temporal shaping of femtosecond pulses