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Related Experiment Video

Updated: Jul 7, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

AM and high-harmonic FM laser mode locking.

R P Scott, C V Bennett, B H Kolner

    Applied Optics
    |August 20, 1997
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel active mode-locking technique combining amplitude-modulated (AM) and frequency-modulated (FM) methods. This approach achieves shorter pulses while maintaining high peak power in lasers.

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    Last Updated: Jul 7, 2026

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    Area of Science:

    • Laser physics
    • Nonlinear optics
    • Photonics

    Background:

    • Active mode locking is crucial for generating ultrashort laser pulses.
    • Combining amplitude-modulated (AM) and frequency-modulated (FM) mode locking presents unique challenges and opportunities.
    • Existing techniques often involve trade-offs between pulse duration and peak power.

    Purpose of the Study:

    • To develop a hybrid active mode-locking technique.
    • To combine the benefits of AM and FM mode locking for enhanced laser performance.
    • To achieve ultrashort pulses with high peak power.

    Main Methods:

    • Simultaneous amplitude-modulated (AM) mode locking at the fundamental repetition rate.
    • Frequency-modulated (FM) mode locking at a high harmonic of the repetition rate.
    • Implementation using a Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser.

    Main Results:

    • Demonstration of a combined AM and FM mode-locking technique.
    • Achieved simultaneous mode locking at 80 MHz (AM) and 1.76 GHz (FM, 22nd harmonic).
    • Generated pulses as short as 16 picoseconds (ps) with a peak power of 6.25 kilowatts (kW).

    Conclusions:

    • The hybrid AM/FM mode-locking technique successfully shortens laser pulses.
    • This method preserves high peak powers achievable at the fundamental repetition rate.
    • The demonstrated technique offers a promising approach for advanced laser applications requiring both short pulses and high energy.