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Actively mode-locked visible upconversion fiber laser.

D M Costantini, H G Limberger, T Lasser

    Optics Letters
    |December 11, 2007
    PubMed
    Summary
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    This study demonstrates active mode locking in a novel Pr(3+)/Yb(3+)-doped upconversion fiber laser. The laser generated short optical pulses at 635 nm using an all-fiber ZnO acousto-optic modulator.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Upconversion fiber lasers offer unique light generation capabilities.
    • Mode locking is crucial for generating ultrashort optical pulses.
    • Acousto-optic modulators are key components in laser systems.

    Purpose of the Study:

    • To demonstrate active mode locking in a Pr(3+)/Yb(3+)-doped upconversion fluoride fiber laser.
    • To investigate the performance of an all-fiber ZnO acousto-optic phase modulator for this application.
    • To achieve efficient generation of optical pulses at a specific wavelength.

    Main Methods:

    • Utilized a Pr(3+)/Yb(3+)-doped upconversion fluoride fiber.
    • Employed an all-fiber ZnO acousto-optic phase modulator for active mode locking.

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  • Characterized the generated optical pulses in terms of duration and repetition rate.

    • Main Results:

    • Successfully achieved active mode locking for the first time in this laser system.
    • Generated optical pulses with a duration of approximately 550 picoseconds.
    • Obtained a repetition rate of 239 MHz at a wavelength of 635 nm.

    Conclusions:

    • Active mode locking is feasible in Pr(3+)/Yb(3+)-doped upconversion fiber lasers.
    • The all-fiber ZnO acousto-optic modulator is an effective device for this purpose.
    • This work paves the way for new applications requiring pulsed red light generation from upconversion lasers.