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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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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.
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Oscillations In An LC Circuit01:30

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Octave-spanning soliton microcomb in silica microdisk resonators.

Jiaxin Gu, Xuan Li, Kai Qi

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    |March 1, 2023
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    Researchers created an octave-spanning soliton microcomb on a chip using a silica microdisk resonator. This advancement in microresonator technology significantly broadens the spectral range and enhances the power of the generated optical frequency comb.

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    Area of Science:

    • Photonics and optical engineering
    • Quantum optics
    • Materials science

    Background:

    • Microcombs are crucial for applications like spectroscopy and optical communications.
    • Generating broadband microcombs requires precise control over microresonator dispersion.
    • Whispering gallery mode microresonators offer high quality factors for efficient light-matter interaction.

    Purpose of the Study:

    • To demonstrate an octave-spanning soliton microcomb on a chip.
    • To optimize dispersion in a silica microdisk resonator for broadband generation.
    • To achieve a high repetition rate and broad spectral coverage in a compact platform.

    Main Methods:

    • Fabrication of a silica microdisk resonator.
    • Dispersion engineering using dry etching techniques.
    • Generation and characterization of a single-soliton microcomb.

    Main Results:

    • Achieved an octave-spanning single-soliton microcomb.
    • Repetition rate of approximately 670 GHz demonstrated.
    • Optical pump power of 162.6 mW required.
    • Observed two dispersive waves extending spectral range and improving comb power.

    Conclusions:

    • The chip-based soliton microcomb in a whispering gallery mode microresonator is a significant advancement.
    • Optimized dispersion is key to achieving octave-spanning spectra.
    • This technology has potential for various applications requiring broadband frequency combs.