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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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 conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High-efficiency pulse compression with externally pumped intracavity Raman oscillators.

F de Rougemont, D K Xian, R Frey

    Optics Letters
    |September 2, 2009
    PubMed
    Summary

    Researchers achieved high-efficiency pulse compression using an externally pumped intracavity Raman oscillator. This method shortens long laser pulses by downconverting energy via stimulated Raman scattering, demonstrating significant pulse shortening capabilities.

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    Area of Science:

    • Nonlinear optics
    • Laser physics
    • Quantum optics

    Background:

    • Pulse compression is crucial for various laser applications.
    • Intracavity Raman oscillators offer potential for efficient frequency conversion.
    • Existing methods face limitations with certain laser media.

    Purpose of the Study:

    • To demonstrate high-efficiency pulse compression using an externally pumped intracavity Raman oscillator.
    • To investigate the downconversion and storage of laser energy via stimulated Raman scattering.
    • To explore the applicability of this technique with absorbing laser media.

    Main Methods:

    • Utilized an externally pumped intracavity Raman oscillator.
    • Employed stimulated Raman scattering to downconvert laser energy.
    • Used hydrogen gas as the Raman medium for energy storage and extraction.

    Main Results:

    • Achieved high-efficiency pulse compression.
    • Demonstrated a pulse shortening factor of 12.5 for a 25-nsec ruby laser pulse.
    • Obtained near 50% quantum efficiency.
    • Showcased the technique's compatibility with absorbing laser media.

    Conclusions:

    • The externally pumped intracavity Raman oscillator is an effective method for high-efficiency pulse compression.
    • This technique enables significant pulse duration reduction with high quantum efficiency.
    • The method overcomes limitations of previous approaches, allowing use with absorbing laser media.