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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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    A novel pulse-saturated seed-injection locking method enables a high-power, narrow-linewidth nanosecond pulse 824 nm laser. This laser is essential for generating deep-ultraviolet lasers via sum-frequency mixing.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • High-average-power, narrow-linewidth nanosecond (ns) pulse 824 nm lasers are critical for generating deep-ultraviolet (DUV) 248 nm lasers.
    • The sum-frequency process requires precise laser parameters for efficient DUV generation.

    Purpose of the Study:

    • To present a novel seed-injection-locked, high-average-power, single-longitudinal-mode (SLM) ns pulse 824 nm laser.
    • To demonstrate a new pulse-saturated seed-injection locking method for improved laser performance.

    Main Methods:

    • Development of a pulse-saturated seed-injection locking technique.
    • Implementation of an optical parametric oscillator (OPO) cavity for laser generation.
    • Characterization of output power, pulse width, and linewidth.

    Main Results:

    • Achieved an output power of 21.2 W at 824 nm with a 15 ns pulse width.
    • Demonstrated a narrow linewidth of 38.8 MHz for the 824 nm laser.
    • Exceeded a signal-to-noise ratio of 28 dB for the modulated sideband signal.

    Conclusions:

    • The novel pulse saturation seed-injection locking method effectively eliminates disturbance, enabling high-power and narrow-linewidth laser output.
    • The developed 824 nm laser shows significant potential for DUV laser generation applications.
    • This work advances the capabilities of OPO cavities for demanding laser applications.