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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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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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Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Series Resonance01:17

Series Resonance

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The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Single-cycle pulse compression in dense resonant media.

Rostislav Arkhipov, Mikhail Arkhipov, Ayhan Demircan

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    |April 6, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel method for compressing optical pulses and increasing their frequency using extreme nonlinear optics. The technique achieves threefold compression and frequency up-conversion, generating attosecond pulses in the XUV range.

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    Area of Science:

    • Extreme nonlinear optics
    • Quantum optics
    • Attosecond physics

    Background:

    • Generating ultrashort optical pulses is crucial for various scientific fields.
    • Existing methods for pulse compression and frequency up-conversion have limitations.

    Purpose of the Study:

    • To propose a new approach for optical pulse compression and frequency up-conversion.
    • To achieve attosecond-scale pulses at high frequencies using optically dense absorbing media.

    Main Methods:

    • Utilizing the dynamics of self-induced transparency (SIT) pulses.
    • Exploiting single-cycle-scale Rabi oscillations in the medium.
    • Simulating the behavior of sub-cycle pulse components as separate SIT pulses.

    Main Results:

    • Achieved threefold compression in pulse duration and frequency up-conversion.
    • Demonstrated the possibility of cascading the scheme for further compression and up-conversion.
    • Simulated the generation of 200 attosecond pulses in the XUV range from a 700 nm single-cycle pulse.

    Conclusions:

    • The proposed method offers an alternative route to attosecond-scale pulses.
    • The technique is effective in optically dense absorbing media.
    • The cascaded scheme shows potential for significant pulse compression and frequency up-conversion.