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Related Experiment Video

Updated: Jun 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Harmonically mode-locked VECSELs for multi-GHz pulse train generation.

Esa J Saarinen, Antti Härkönen, Robert Herda

    Optics Express
    |June 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study explores harmonic mode-locking in optically-pumped vertical-external-cavity surface-emitting lasers (VECSELs). We investigated multiple pulse formation for generating high-repetition-rate laser pulse trains.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Optically-pumped vertical-external-cavity surface-emitting lasers (VECSELs) are crucial for various photonic applications.
    • Passively mode-locking VECSELs with semiconductor saturable-absorber mirrors (SESAMs) enables ultrashort pulse generation.

    Purpose of the Study:

    • To investigate the potential of harmonic mode-locking in VECSELs.
    • To explore the formation of multiple pulses in passively mode-locked VECSELs.
    • To achieve multigigahertz repetition rates in laser pulse trains.

    Main Methods:

    • Utilized optically-pumped VECSELs.
    • Employed semiconductor saturable-absorber mirrors (SESAMs) for passive mode-locking.
    • Systematically studied harmonic mode-locking and multiple pulse formation.

    Main Results:

    • Demonstrated harmonic mode-locking in VECSELs.
    • Observed and analyzed multiple pulse formation.
    • Achieved pulse trains with multigigahertz repetition rates.

    Conclusions:

    • Harmonic mode-locking is a viable method for increasing repetition rates in VECSELs.
    • This work provides the first systematic study on multiple pulse formation in passively mode-locked VECSELs.
    • The findings pave the way for VECSELs operating at higher frequencies.