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相关概念视频

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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MOSFET Amplifiers01:17

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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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Linear time-invariant Systems01:23

Linear time-invariant Systems

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A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...
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Non-ohmic Devices00:51

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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.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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Cascaded Op Amps01:16

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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
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Voltage Dividers01:14

Voltage Dividers

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In electrical circuits, resistors can be connected in series, sequentially linked one after the other. In a series configuration, the same current flows through each resistor. Ohm's law is a fundamental principle to understand the behavior of resistors in series. It expresses the voltage across these resistors in terms of the current and resistance.
Kirchhoff's voltage law implies that the sum of the voltages across the resistors in series equals the source voltage. This means that the...
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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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单立体VECSEL用于稳定的kHz线宽.

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    此摘要是机器生成的。

    我们开发了一个紧的,可调节的单体VECSEL,用于超窄的线宽. 这种新型激光器实现了低于kHz的线宽,为先进应用提供了显著的降噪.

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    科学领域:

    • 半导体激光物理 半导体激光物理
    • 量子光学就是量子光学.
    • 光子工程的工程学是光子学.

    背景情况:

    • 垂直外腔表面发射激光器 (VECSEL) 对于要求超连贯性和低噪声的应用至关重要.
    • 目前的VECSEL通常依赖于复杂的空隙共振器来实现所需的性能.
    • 实现长时间的洞内光子寿命是A级低噪声系统和功率扩展的关键.

    研究的目的:

    • 开发一个紧的,电子调节的,单立体腔体VECSEL.
    • 通过抑制环境噪音来实现超窄的自由运行线宽.
    • 为了展示一个新的VECSEL架构,提高稳定性和性能.

    主要方法:

    • 将一个带有集成DBR的增益结构光学粘合到一个无空隙的化晶体镜共振器上.
    • 使用具有完全内部反射的单立体腔,以提高稳定性.
    • 通过稳定温度和剪切压电传感器实现无模式跳转的波长调节.

    主要成果:

    • 在ms的时间尺度上实现了分kHz的自由运行线宽.
    • 在1秒的时间采样中证明了<1.9kHz的线宽,这是两个数量级的改善.
    • 单体VECSEL比NPROs具有优势,包括定制的波长和没有放松振荡.

    结论:

    • 单体VECSEL提供了一个强大的,紧的,稳定的超连贯激光源.
    • 这项技术具有功率可扩展性,可适应各种波长 (可见到中红外).
    • 能够在远程计量学和光学时钟等量子技术中实现现实应用.