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Related Experiment Video

Updated: Jun 20, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Subpicosecond pulse generation from a Nd:glass laser using a nonlinear external cavity.

F Krausz, C Spielmann, T Brabec

    Optics Letters
    |September 22, 2009
    PubMed
    Summary

    Researchers achieved subpicosecond pulse generation using a nonlinear external resonator with a mode-locked Nd:glass laser. This method significantly shortens 20-picosecond pulses to under 1 picosecond at low pump power.

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Materials science

    Background:

    • Mode-locked lasers are crucial for generating ultrashort optical pulses.
    • External resonators can enhance laser performance but often require high pump powers.

    Purpose of the Study:

    • To investigate the use of a nonlinear external resonator for pulse shortening.
    • To achieve subpicosecond pulse generation from a continuous-wave mode-locked laser.

    Main Methods:

    • Coupling a continuous-wave, actively mode-locked Nd:glass laser to a nonlinear external resonator.
    • Utilizing a krypton laser at 0.8 microm for pumping.
    • Employing nonlinear external cavity feedback for pulse manipulation.

    Main Results:

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    • Successfully shortened 20-picosecond pulses to less than 1 picosecond.
    • Achieved subpicosecond pulse generation at a low pump power of 500 mW.

    Conclusions:

    • Nonlinear external resonators are effective for generating ultrashort pulses.
    • This technique offers a low-power, efficient method for subpicosecond pulse generation.