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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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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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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Monolithic VECSEL for stable kHz linewidth.

Martin Lee, Paulo Hisao Moriya, Jennifer E Hastie

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    We developed a compact, tunable monolithic VECSEL for ultra-narrow linewidths. This new laser achieves sub-kHz linewidths, offering a significant noise reduction for advanced applications.

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    Area of Science:

    • Semiconductor laser physics
    • Quantum optics
    • Photonics engineering

    Background:

    • Vertical-external-cavity surface-emitting lasers (VECSELs) are crucial for applications demanding ultra-coherence and low noise.
    • Current VECSELs often rely on complex, air-spaced resonators to achieve desired performance.
    • Achieving long intra-cavity photon lifetimes is key for the class-A low noise regime and power scaling.

    Purpose of the Study:

    • To develop a compact, electronically tunable, monolithic-cavity VECSEL.
    • To achieve ultra-narrow free-running linewidths by suppressing environmental noise.
    • To demonstrate a new VECSEL architecture with improved stability and performance.

    Main Methods:

    • Optically bonding a gain structure with an integrated DBR to an air-gap-free fused-silica prism resonator.
    • Utilizing a monolithic cavity with total internal reflection to enhance stability.
    • Implementing mode-hop-free wavelength tuning via stabilized temperature and a shear piezoelectric transducer.

    Main Results:

    • Achieved sub-kHz free-running linewidths over ms timescales.
    • Demonstrated <1.9 kHz linewidth for 1s time sampling, a two-orders-of-magnitude improvement.
    • The monolithic VECSEL offers advantages over NPROs, including tailored wavelengths and no relaxation oscillations.

    Conclusions:

    • The monolithic VECSEL provides a robust, compact, and stable ultra-coherent laser source.
    • This technology is power-scalable and adaptable to various wavelengths (visible to mid-infrared).
    • Enables real-world applications in remote metrology and quantum technologies like optical clocks.