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Related Concept Videos

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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Double Resonance Techniques: Overview01:12

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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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Concept of Resonance and its Characteristics01:19

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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Exceptional point proximity-driven mode-locking in coupled microresonators.

Riku Imamura, Shun Fujii, Ayata Nakashima

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    This summary is machine-generated.

    Mode-locking is achieved in coupled-cavity systems without a saturable absorber. A lossy cavity acts as an artificial saturable absorber near an exceptional point, enabling efficient mode-locking.

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    Area of Science:

    • Photonics and Optical Engineering
    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Mode-locking is crucial for generating ultrashort optical pulses.
    • Conventional mode-locking often relies on saturable absorbers, which can be complex to integrate.
    • Exceptional points in open systems offer unique phenomena for optical control.

    Purpose of the Study:

    • To demonstrate theoretically and numerically the feasibility of mode-locking in coupled-cavity systems.
    • To introduce a novel approach using an artificial saturable absorber.
    • To highlight the advantages of this new method over traditional techniques.

    Main Methods:

    • Theoretical analysis of coupled-cavity systems with gain and loss.
    • Numerical simulations to verify mode-locking conditions.
    • Investigation of system Q-factor modulation near exceptional points.

    Main Results:

    • Mode-locking is achievable without a natural saturable absorber.
    • Exceptional points lead to significant Q-factor modulation with minimal nonlinear effects.
    • A lossy auxiliary cavity effectively functions as an artificial saturable absorber.

    Conclusions:

    • A novel, efficient method for mode-locking in coupled-cavity systems is presented.
    • This approach offers reduced operational power and easier post-adjustment.
    • The use of exceptional points and artificial absorbers opens new avenues in laser design.