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Interferometric time-domain ptychography for ultrafast pulse characterization.

Janne Hyyti, Esmerando Escoto, Günter Steinmeyer

    Optics Letters
    |June 2, 2017
    PubMed
    Summary
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    A new pulse characterization technique, ptychographic-interferometric frequency-resolved optical gating (πFROG), simplifies measurements and eliminates time ambiguity. This method accurately characterizes ultrashort laser pulses, even with dispersion.

    Area of Science:

    • Ultrafast optics
    • Quantum optics
    • Nonlinear optics

    Background:

    • Characterizing ultrashort laser pulses is crucial for many scientific applications.
    • Existing methods like frequency-resolved optical gating (FROG) have limitations, including direction-of-time ambiguity and sensitivity to geometrical distortions.
    • Few-cycle pulses, essential for advanced research, are particularly challenging to measure accurately.

    Purpose of the Study:

    • To introduce a novel pulse characterization technique, ptychographic-interferometric frequency-resolved optical gating (πFROG).
    • To demonstrate the simplicity and effectiveness of πFROG for measuring ultrashort, few-cycle laser pulses.
    • To eliminate the direction-of-time ambiguity inherent in many second-order FROG methods.

    Main Methods:

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  • Combining interferometric FROG with time-domain ptychography to create the πFROG technique.
  • Utilizing a simple, collinear beam geometry similar to second-harmonic FROG, with an added bandpass filter.
  • Testing the method with nanojoule, three-cycle pulses at 800 nm and comparing results with spectral phase interferometry.

    • Main Results:

    • The πFROG method successfully characterized ultrashort pulses with agreement within a fraction of a femtosecond compared to established techniques.
    • The technique demonstrated robustness against group delay dispersion, with characteristic tilts in traces indicating uncompensated dispersion.
    • πFROG accurately reproduced dispersion values calculated using Sellmeier equations when group delay dispersion was intentionally added.

    Conclusions:

    • Ptychographic-interferometric frequency-resolved optical gating (πFROG) offers a simplified, robust, and unambiguous method for ultrashort pulse characterization.
    • The collinear geometry and inherent capabilities of πFROG make it ideal for measuring challenging few-cycle pulses.
    • πFROG provides a powerful new tool for researchers needing precise measurements of optical pulse properties, including dispersion.