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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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High-frequency acousto-optic mode locker for picosecond pulse generation.

U Keller, K D Li, B T Khuri-Yakub

    Optics Letters
    |September 18, 2009
    PubMed
    Summary

    A new acousto-optic mode locker was developed for high-frequency lasers. This device achieved 10 picosecond pulses, demonstrating its effectiveness in advanced laser systems.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Acousto-optic mode lockers are crucial for generating ultrashort laser pulses.
    • Optimizing mode locker design requires careful material selection and performance metrics.

    Purpose of the Study:

    • To design and construct a high-frequency acousto-optic mode locker.
    • To evaluate the performance of zinc oxide on sapphire substrates for mode-locking applications.

    Main Methods:

    • Modeled and designed a 500-MHz acousto-optic mode locker.
    • Utilized zinc oxide sputtered onto a sapphire substrate for the transducer.
    • Defined a new figure of merit for mode-locker design.

    Main Results:

    • Achieved 28% diffraction efficiency per 1 W drive power.
    • Sapphire identified as a suitable substrate material based on the new figure of merit.
    • Generated laser pulses with widths under 10 picoseconds.

    Conclusions:

    • The developed acousto-optic mode locker is effective for high-repetition-rate lasers.
    • The study validates sapphire as a superior substrate for acousto-optic devices.
    • The design enables efficient generation of ultrashort pulses from diode-pumped Nd:YLF lasers.