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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 10, Iss. 5 — May. 1, 1993
  • pp: 1101–1111

Using phase retrieval to measure the intensity and phase of ultrashort pulses: frequency-resolved optical gating

Rick Trebino and Daniel J. Kane  »View Author Affiliations


JOSA A, Vol. 10, Issue 5, pp. 1101-1111 (1993)
http://dx.doi.org/10.1364/JOSAA.10.001101


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Abstract

We recently introduced a new technique, frequency-resolved optical gating (FROG), for directly determining the full intensity I(t) and phase φ(t) of a single femtosecond pulse. By using almost any instantaneous nonlinear-optical interaction of two replicas of the ultrashort pulse to be measured, FROG involves measuring the spectrum of the signal pulse as a function of the delay between the replicas. The resulting trace of intensity versus frequency and delay yields an intuitive display of the pulse that is similar to the pulse spectrogram, except that the gate is a function of the pulse to be measured. The problem of inverting the FROG trace to obtain the pulse intensity and phase can also be considered a complex two-dimensional phase-retrieval problem. As a result, the FROG trace yields, in principle, an essentially unique pulse intensity and phase. We show that this is also the case in practice. We present an iterative-Fourier-transform algorithm for inverting the FROG trace. The algorithm is unusual in its use of a novel constraint: the mathematical form of the signal field. Without the use of a support constraint, the algorithm performs quite well in practice, even for pulses with serious phase distortions and for experimental data with noise, although it occasionally stagnates when pulses with large intensity fluctuations are used.

© 1993 Optical Society of America

History
Original Manuscript: September 16, 1992
Revised Manuscript: December 1, 1992
Manuscript Accepted: October 9, 1992
Published: May 1, 1993

Citation
Rick Trebino and Daniel J. Kane, "Using phase retrieval to measure the intensity and phase of ultrashort pulses: frequency-resolved optical gating," J. Opt. Soc. Am. A 10, 1101-1111 (1993)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-10-5-1101


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