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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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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Related Experiment Video

Updated: Jun 16, 2025

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High power narrow bandwidth picosecond PPLN-OPO.

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    |June 14, 2025
    PubMed
    Summary

    This study demonstrates a high-power, narrow-bandwidth optical parametric oscillator (OPO) for generating picosecond mid-infrared (MIR) laser sources. The synchronously pumped OPO achieved 4.3 W output power with a compressed bandwidth of 0.25 nm.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Achieving narrow bandwidth and high power simultaneously in picosecond MIR sources remains a challenge.

    Purpose of the Study:

    • To demonstrate a high-power, narrow-bandwidth, synchronously pumped periodically poled lithium niobate (PPLN) OPO.
    • To investigate the effectiveness of a reflective volume Bragg grating (RVBG) for spectral control.

    Main Methods:

    • Utilized a synchronously pumped PPLN OPO configuration.
    • Employed a reflective volume Bragg grating (RVBG) to lock signal wavelength and compress bandwidth.
    • Characterized output power, wavelength, bandwidth, beam quality, and stability.

    Main Results:

    • Achieved an output power of 4.3 W at 1908.1 nm with a compressed bandwidth of 0.25 nm.
    • Operated at a repetition rate of 80 MHz with good beam quality factors (1.30 and 1.68).
    • Demonstrated high output power and directional stability (RMS = 1.4% and 49.58 μrad).

    Conclusions:

    • Synchronously pumped OPOs are effective for generating narrow-bandwidth picosecond MIR laser sources.
    • RVBG is a viable method for precise wavelength locking and bandwidth compression.
    • The demonstrated OPO system shows promise for applications requiring high-quality MIR laser output.