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In-line femtosecond common-path interferometer in reflection mode.

J Chandezon, J-M Rampnoux, S Dilhaire

    Optics Express
    |October 20, 2015
    PubMed
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    A novel femtosecond time-resolved interferometer measures ultrafast optical changes by using a single crystal for pulse generation and recombination. This method offers a new way to study material dynamics with high temporal resolution.

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    Area of Science:

    • Optics
    • Materials Science
    • Spectroscopy

    Background:

    • Femtosecond interferometry is crucial for studying ultrafast phenomena.
    • Reflection mode measurements are challenging for time-resolved techniques.
    • Existing methods often require complex setups.

    Purpose of the Study:

    • To propose an innovative method for femtosecond time-resolved interferometry in reflection mode.
    • To develop a compact and passive common-path interferometer.
    • To measure the temporal derivative of ultrafast changes in optical properties.

    Main Methods:

    • Combined pump-probe setup with a passive in-line common-path interferometer.
    • Utilized a single birefringent crystal for phase-locked pulse generation and recombination.
    • Analytical modeling to predict interferometer behavior.

    Main Results:

    • The interferometer successfully measures the temporal derivative of ultrafast changes in the complex optical reflection coefficient.
    • Demonstrated working conditions using picosecond opto-acoustic experiments on a thin film.
    • Validated the effectiveness of the single birefringent crystal approach.

    Conclusions:

    • The proposed method provides an innovative approach to femtosecond time-resolved reflection interferometry.
    • The compact common-path design simplifies experimental setup.
    • The technique is suitable for investigating ultrafast dynamics in materials.