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Self-mode-locked quantum-dot vertical-external-cavity surface-emitting laser.

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    We developed the first self-mode-locked quantum-dot laser, achieving sub-picosecond pulses and record peak power. This advancement in ultrafast optics offers new possibilities for high-power laser applications.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Ultrafast Science

    Background:

    • Quantum-dot semiconductor lasers are promising for ultrafast light generation.
    • Optically pumped semiconductor disk lasers offer high power scalability.
    • Mode-locking is crucial for generating ultrashort laser pulses.

    Purpose of the Study:

    • To demonstrate the first self-mode-locked optically pumped quantum-dot semiconductor disk laser.
    • To characterize the laser's performance, including pulse duration, peak power, and repetition rate.
    • To investigate the impact of temperature on pulse characteristics and mode-locking stability.

    Main Methods:

    • Fabrication of an optically pumped quantum-dot semiconductor disk laser.
    • Implementation of a self-mode-locking mechanism.
    • Characterization of output pulses using an autocorrelator and optical spectrum analyzer.
    • Temperature-dependent measurements of pulse duration and time-bandwidth product.

    Main Results:

    • Successful demonstration of a self-mode-locked quantum-dot semiconductor disk laser.
    • Generation of sub-picosecond pulses at a 1040 nm wavelength.
    • Achieved record peak power of 460 W at a 1.5 GHz repetition rate.
    • Investigated temperature dependence of pulse duration and time-bandwidth product.

    Conclusions:

    • The developed laser is the first of its kind, combining quantum-dot gain medium with self-mode-locking in a semiconductor disk laser architecture.
    • The device exhibits excellent performance, including high peak power and ultrashort pulse generation.
    • Temperature tuning offers a method to optimize pulse characteristics for stable mode-locking.