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Harmonically mode-locked Ti:Er:LiNbO(3) waveguide laser.

H Suche, R Wessel, S Westenhöfer

    Optics Letters
    |October 28, 2009
    PubMed
    Summary
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    Researchers achieved active mode locking in an Er-diffusion-doped Ti:LiNbO(3) waveguide laser up to the fourth harmonic (5.12 GHz). This diode-pumped laser emits ultrashort pulses for advanced optical applications.

    Area of Science:

    • Photonics
    • Laser Technology
    • Materials Science

    Background:

    • Erbium-doped titanium-indiffused lithium niobate (Er:Ti:LiNbO3) waveguide lasers are crucial for optical communications.
    • Achieving high-frequency mode locking is essential for generating ultrashort optical pulses.

    Purpose of the Study:

    • To demonstrate active mode locking in an Er:Ti:LiNbO3 waveguide laser.
    • To investigate the performance of intracavity phase modulation for high-harmonic mode locking.

    Main Methods:

    • Utilized intracavity phase modulation to achieve active mode locking.
    • Employed a diode-pumped, packaged Er:Ti:LiNbO3 waveguide laser with a monolithically integrated phase modulator.
    • Operated the laser at the fourth harmonic (5.12 GHz) of the axial-mode frequency spacing.

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    Main Results:

    • Achieved active mode locking up to the fourth harmonic (5.12 GHz).
    • Obtained transform-limited pulses with durations of >=3.8 ps and pulse energy of <=5.6 pJ at 1602 nm.
    • Demonstrated a low threshold of 9 mW incident pump power.
    • Measured a mode-locking frequency change of 3.65 x 10^-5 /°C with temperature.
    • Determined a mode-locking acceptance bandwidth of +/-75 kHz.

    Conclusions:

    • Successfully demonstrated high-frequency active mode locking in an Er:Ti:LiNbO3 waveguide laser.
    • The developed laser system is suitable for generating ultrashort pulses with practical parameters.
    • The results indicate potential for applications in high-speed optical signal processing and telecommunications.