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Related Experiment Video

Updated: Jun 12, 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

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Narrow-linewidth, multimode-background-suppressed dual-wavelength Ti: sapphire laser based on a composite

Yuntao Bai, Ying Xie, Xin Ding

    Optics Express
    |June 11, 2026
    PubMed
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    A tunable, narrow-linewidth dual-wavelength laser was developed using a prism pair and a Littman-grating cavity. This laser offers flexible wavelength tuning and overcomes limitations of previous designs.

    Area of Science:

    • * Physics
    • * Optical Engineering
    • * Laser Technology

    Background:

    • * Traditional Ti:sapphire lasers often suffer from multimode background and limited tuning capabilities.
    • * Achieving stable, narrow-linewidth dual-wavelength output is crucial for various spectroscopic applications.

    Purpose of the Study:

    • * To demonstrate a widely tunable, narrow-linewidth dual-wavelength Ti:sapphire laser.
    • * To overcome the limitations of conventional Littman-grating lasers.
    • * To achieve flexible and accurate dual-wavelength frequency selection.

    Main Methods:

    • * Incorporation of a prism pair into the gain cavity for enhanced spatial dispersion and mode selection.
    • * Utilizing a Littman-grating dual self-injection structure in the dispersive cavity for precise frequency selection.

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    Last Updated: Jun 12, 2026

    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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    Published on: November 22, 2019

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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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  • * Independent tuning of cavity end mirrors and dispersive cavity reflectors for wavelength control.

    • Main Results:

    • * Successfully demonstrated a tunable, narrow-linewidth dual-wavelength Ti:sapphire laser across the 740-870 nm range.
    • * Achieved arbitrary wavelength combinations with continuously adjustable intervals and linewidths < 3 pm.
    • * Obtained a maximum total output power of 4.2 W at 780 nm and 800 nm with a pump power of 40.8 W, yielding a 10.28% conversion efficiency.

    Conclusions:

    • * The combined prism pair and Littman-grating dual self-injection cavity effectively suppresses unwanted longitudinal modes.
    • * This novel design enables flexible tuning and accurate selection of dual wavelengths, surpassing previous limitations.
    • * The demonstrated laser system offers a versatile platform for applications requiring precise dual-wavelength outputs.