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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 16, Iss. 6 — Jun. 1, 1999
  • pp: 1268–1276

New approach to determine the intensity and phase of ultrashort pulses by use of time-to-space conversion and a noniterative phase-retrieval algorithm

Nobuharu Nakajima and Yasuo Tomita  »View Author Affiliations

JOSA A, Vol. 16, Issue 6, pp. 1268-1276 (1999)

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We propose a novel scheme for directly determining the intensity and phase of ultrashort pulses. The technique involves time-to-space conversion of an input pulse by a diffraction grating, followed by the detection of its spectral intensity distributions in the Fourier transform plane with and without an exponential filter placed in front of the grating. By use of an efficient noniterative phase-retrieval algorithm, the spectral phase of the pulse is retrieved from these spectral intensities. The intensity and phase of the pulse in the temporal domain can be reconstructed by the inverse Fourier transformation of the retrieved spectral amplitude. Computer simulation results confirm that robust reconstructions of a linearly chirped pulse and a pulse with quadratic and cubic spectral phases are possible with high fidelity.

© 1999 Optical Society of America

OCIS Codes
(320.0320) Ultrafast optics : Ultrafast optics
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7160) Ultrafast optics : Ultrafast technology

Original Manuscript: August 10, 1998
Revised Manuscript: December 2, 1998
Manuscript Accepted: January 25, 1999
Published: June 1, 1999

Nobuharu Nakajima and Yasuo Tomita, "New approach to determine the intensity and phase of ultrashort pulses by use of time-to-space conversion and a noniterative phase-retrieval algorithm," J. Opt. Soc. Am. A 16, 1268-1276 (1999)

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  22. Note that the purpose of preparing two replicas of a test pulse in our system is merely to realize the temporal gating of the filtered test pulse in the Fourier plane at an appropriate delay, not to obtain the spectral interferogram.

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