Phase retrieval and time-frequency methods in the measurement of ultrashort laser pulses

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Recently several techniques have become available to measure the time- (or frequency-) dependent intensity and phase of ultrashort laser pulses. One of these, Frequency-Resolved Optical Gating (FROG), is rigorous and has achieved single-laser-shot operation. FROG combines the concepts of time-frequency analysis in the form of spectrogram generation (in order to create a two-dimensional problem), and uses a phase-retrieval-based algorithm to invert the experimental data to yield the intensity and phase of the laboratory laser pulse. In FROG it is easy to generate a spectrogram of the unknown signal, and inversion of the spectrogram to recover the signal is the main ... continued below

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4 p.

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DeLong, K.W.; Fittinghoff, D.N.; Ladera, C.L. & Trebino, R. February 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Livermore, CA (United States)
    Place of Publication: Livermore, California

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Description

Recently several techniques have become available to measure the time- (or frequency-) dependent intensity and phase of ultrashort laser pulses. One of these, Frequency-Resolved Optical Gating (FROG), is rigorous and has achieved single-laser-shot operation. FROG combines the concepts of time-frequency analysis in the form of spectrogram generation (in order to create a two-dimensional problem), and uses a phase-retrieval-based algorithm to invert the experimental data to yield the intensity and phase of the laboratory laser pulse. In FROG it is easy to generate a spectrogram of the unknown signal, and inversion of the spectrogram to recover the signal is the main goal. Because the temporal width of a femtosecond laser pulse is much shorter than anything achievable by electronics, FROG uses the pulse to measure itself. In FROG, the laser pulse is split into two replicas of itself by a partially reflecting beamsplitter, and the two replicas interact with each other in a medium with an instantaneous nonlinear-optical response. This interaction generates a signal field that is then frequency-resolved using a spectrometer. The spectrum of the signal field is measured for all relevant values of the temporal delay between the two pulses. Here, the authors employ FROG and FROG related techniques to measure the time-dependent intensity and phase of an ultrashort laser pulse.

Physical Description

4 p.

Notes

OSTI as DE95006499

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  • Signal recovery and synthesis conference, Salt Lake City, UT (United States), 12 Mar 1995

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  • Other: DE95006499
  • Report No.: SAND--95-8458C
  • Report No.: CONF-950396--2
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 28340
  • Archival Resource Key: ark:/67531/metadc668498

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  • February 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 12, 2016, 8:20 p.m.

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DeLong, K.W.; Fittinghoff, D.N.; Ladera, C.L. & Trebino, R. Phase retrieval and time-frequency methods in the measurement of ultrashort laser pulses, article, February 1, 1995; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc668498/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.