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Related Experiment Video

Updated: Jun 19, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

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

Published on: November 22, 2019

Kerr-lens mode locking without dispersion compensation.

S Gatz, J Herrmann, M Müller

    Optics Letters
    |November 3, 2009
    PubMed
    Summary

    We introduce a new method for femtosecond lasers using a semiconductor plate to achieve self-defocusing nonlinearity. This approach enables stable ultrashort pulse generation without needing group-velocity dispersion compensation.

    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Solid-State Lasers

    Background:

    • Femtosecond lasers are crucial for various scientific applications.
    • Group-velocity dispersion (GVD) compensation is typically required for stable ultrashort pulse generation.
    • Kerr-lens mode-locking (KLM) is a common technique for generating femtosecond pulses.

    Purpose of the Study:

    • To propose and theoretically investigate a novel operating regime for femtosecond Kerr-lens mode-locked solid-state lasers.
    • To demonstrate a method that avoids the need for group-velocity dispersion compensation.
    • To achieve stable femtosecond pulse generation using an effective self-defocusing nonlinearity.

    Main Methods:

    • Theoretical investigation of a novel operating regime for femtosecond lasers.

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  • Utilizing a nonresonant semiconductor plate in the focused resonator section.
  • Derivation of saturable loss using a generalized ABCD matrix formalism.
  • Analysis of an effective self-defocusing nonlinearity.

    • Main Results:

    • Stable femtosecond pulse generation is achieved without group-velocity dispersion compensation.
    • The proposed method provides an overall negative nonlinear refractive index per round trip.
    • The laser resonator exhibits effective self-defocusing nonlinearity.

    Conclusions:

    • A novel operating regime for femtosecond Kerr-lens mode-locked solid-state lasers has been theoretically validated.
    • The use of a semiconductor plate offers a practical solution for self-defocusing nonlinearity, eliminating the need for GVD compensation.
    • This research paves the way for simpler and more robust femtosecond laser systems.