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Related Concept Videos

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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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Updated: Jul 25, 2025

Implementation of a Coherent Anti-Stokes Raman Scattering CARS System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope
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Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers.

Mayuri Nakagawa, Natsuki Kanda, Toshio Otsu

    Optics Express
    |June 29, 2023
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    Summary

    This study presents a novel jitter correction technique for asynchronous optical sampling terahertz time-domain spectroscopy. The method enables precise THz waveform measurements by suppressing jitter below 0.1 ps.

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    Area of Science:

    • Terahertz (THz) spectroscopy
    • Optical sampling techniques
    • Spectroscopic measurement methods

    Background:

    • Asynchronous optical sampling (ASOPS) THz time-domain spectroscopy (TDLS) is a powerful technique.
    • Jitter in free-running oscillators can limit the precision and bandwidth of ASOPS TDLS measurements.
    • Accurate jitter monitoring and correction are crucial for high-resolution THz spectroscopy.

    Purpose of the Study:

    • To develop and demonstrate a software-based jitter correction method for ASOPS THz-TDLS.
    • To improve the accuracy and resolution of THz spectroscopic measurements.
    • To enable robust ASOPS measurements with a simplified and compact experimental setup.

    Main Methods:

    • Utilized two free-running oscillators for ASOPS THz-TDLS.
    • Simultaneously recorded the THz waveform and a harmonic of the laser repetition rate difference (Δfr).
    • Implemented software-based correction to suppress residual jitter below 0.1 ps.

    Main Results:

    • Successfully suppressed residual jitter to below 0.1 ps.
    • Achieved accumulation of THz waveforms without loss of measurement bandwidth.
    • Resolved absorption linewidths below 1 GHz in water vapor measurements.
    • Demonstrated a robust, flexible, simple, and compact ASOPS setup.

    Conclusions:

    • The developed jitter correction method enhances the performance of ASOPS THz-TDLS.
    • The technique allows for high-resolution spectroscopic measurements with a simplified setup.
    • This approach offers a flexible and robust solution for THz time-domain spectroscopy.