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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper CTUA2

Direct measurement of femtosecond pulses in amplitude and phase

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Abstract

A direct measurement in amplitude and phase of a femtosecond light pulse is performed, for the first time to our knowledge. The measurement is made in the frequency domain, and the time dependence of the field can be easily obtained by a Fourier transform. The technique relies on a pulse synthesis scheme1 to unravel the frequency dependence of the phase. A mask filters the spectrum giving rise to a pulse with a measurable temporal profile related to the frequency dependence of the phase. In particular with a rectangular slit, the time delay of the synthesized pulse is the first derivative of the phase with respect to the frequency of the original pulse at the central frequency of the filter. The amplitude of the spectrum is obtained from the power spectrum.

© 1990 Optical Society of America

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