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Related Concept Videos

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.
Spin decoupling is usually achieved by...
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.
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Related Experiment Video

Updated: Jul 10, 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

Adaptive pulse compression by two-photon absorption in semiconductors.

U Siegner, M Haiml, J Kunde

    Optics Letters
    |November 17, 2007
    PubMed
    Summary

    We used adaptive learning to optimize laser pulses, employing two-photon absorption in semiconductors for accurate pulse compression. This method offers a simpler alternative to traditional techniques for broadband laser applications.

    Related Experiment Videos

    Last Updated: Jul 10, 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

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Semiconductor Physics

    Background:

    • Adaptive learning algorithms are increasingly used for complex optical system optimization.
    • Two-photon absorption (TPA) is a nonlinear optical process with potential applications in pulse characterization.
    • Broadband laser pulse compression is crucial for various scientific and technological applications.

    Purpose of the Study:

    • To investigate the adaptive optimization of broadband laser pulses using a closed-loop learning algorithm.
    • To evaluate the efficacy of two-photon absorption (TPA) as a merit function for pulse compression.
    • To demonstrate the feasibility of TPA for achieving bandwidth-limited pulse compression.

    Main Methods:

    • A closed-loop learning algorithm was employed for adaptive optimization.
    • Two-photon absorption in semiconductors served as the merit function.
    • Experiments involved photoluminescence of Cadmium Sulfide (CdS) thin films.
    • Photocurrent measurements of a Gallium Arsenide Phosphide (GaAsP) photodiode were conducted.

    Main Results:

    • Reliable and accurate pulse compression to the bandwidth limit was achieved.
    • The TPA-based method proved unperturbed by nontrivial phase effects.
    • Experimental data validated the effectiveness of the adaptive optimization approach.

    Conclusions:

    • Two-photon absorption is a viable and straightforward alternative to second-harmonic generation for broadband laser pulse compression.
    • The adaptive optimization strategy enables precise control over laser pulse characteristics.
    • This research facilitates advancements in ultrafast optics and laser technology.