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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Wavelength and pulse width programmable mode-locked Yb fiber laser.

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    This study introduces the first mode-locked Yb fiber laser with an electrically tunable filter, enabling precise control over ultrashort pulse characteristics for advanced laser applications.

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    Area of Science:

    • Photonics and Laser Technology
    • Materials Science

    Background:

    • Mode-locked fiber lasers are crucial for generating ultrashort pulses.
    • Controlling pulse characteristics like wavelength and width is essential for tunable laser systems.

    Purpose of the Study:

    • To demonstrate a novel mode-locked polarization-maintaining Yb fiber laser.
    • To integrate a liquid-crystal-on-silicon (LCOS) electrically programmable filter for tunable pulse characteristics.

    Main Methods:

    • Development and characterization of a polarization-maintaining Yb fiber laser cavity.
    • Incorporation of an LCOS-based electrically programmable filter for intracavity tuning.
    • Numerical simulations to validate experimental findings and confirm mode-locking.

    Main Results:

    • Achieved continuous tuning of wavelength from 1018-1065 nm.
    • Demonstrated continuous tuning of pulse width from 0.3-2.6 picoseconds.
    • Experimental and simulation results confirmed stable mode-locked pulse generation.

    Conclusions:

    • The developed laser system represents a significant advancement in tunable ultrashort pulse generation.
    • The LCOS filter provides effective and continuous control over laser pulse parameters.
    • This technique shows promise for developing seed lasers in multifunctional ultrashort-pulse laser systems.