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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.
Characteristics of OpAmp01:17

Characteristics of OpAmp

The operational amplifier, commonly known as an op-amp, is a specially designed electronic circuit component. Its purpose is to work in conjunction with other circuit elements to execute a defined signal-processing operation. Consider an equivalent circuit model of an op-amp, as depicted in Figure 1; the output section comprises a voltage-controlled source in parallel with the output resistance Ro.
Pulse amplitude and quality01:17

Pulse amplitude and quality

Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Upsampling01:22

Upsampling

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Related Experiment Video

Updated: Jun 23, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Ultrafast pulse shaping: amplification and characterization.

M Fetterman, D Goswami, D Keusters

    Optics Express
    |April 23, 2009
    PubMed
    Summary
    This summary is machine-generated.

    High-resolution amplified pulse shaping was achieved using an acousto-optic modulator (AOM) at 795nm. This technique enables complex pulse shaping for advanced laser experiments.

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    Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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    Published on: August 6, 2018

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    Last Updated: Jun 23, 2026

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
    08:22

    Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

    Published on: August 6, 2018

    Area of Science:

    • Physics
    • Optical Engineering
    • Laser Science

    Background:

    • Advanced laser systems require precise control over pulse characteristics.
    • Acousto-optic modulators (AOMs) offer potential for dynamic spectral manipulation.

    Purpose of the Study:

    • To demonstrate high-resolution amplified pulse shaping using an AOM at 795nm.
    • To achieve complex amplitude and phase modulation for specific experimental needs.

    Main Methods:

    • Utilized an acousto-optic modulator (AOM) for pulse shaping at a 795nm center-wavelength.
    • Employed predistortion techniques to control pulse amplitude and phase.
    • Characterized shaped pulses using Spectrally and Temporally Resolved Upconversion Technique (STRUT).

    Main Results:

    • Generated output pulses with 200mJ energy and 150fs transform-limited pulsewidth.
    • Achieved spectral modulation with over 40 features within a single pulse.
    • Successfully created complex pulse shapes, including hyperbolic secant amplitude and hyperbolic tangent frequency sweep.

    Conclusions:

    • Acousto-optic modulators enable high-fidelity, high-resolution amplified pulse shaping.
    • The demonstrated technique allows for precise control over pulse amplitude and phase.
    • The generated complex pulse shapes are suitable for applications like adiabatic rapid passage experiments.