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相关概念视频

Couples: Scalar and Vector Formulation01:21

Couples: Scalar and Vector Formulation

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One might wonder how the captain of a large ship can navigate through the ocean with just a turn of the steering wheel. The answer lies in the concept of two parallel forces that are equal in magnitude and opposite sense, creating a couple moment.
A couple moment is a rotational force that tends to rotate the steering wheel. The wheel's rotation can either be in a clockwise or anticlockwise direction. The right-hand rule is a helpful method for determining the direction of a couple moment....
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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Symmetry in Maxwell's Equations01:28

Symmetry in Maxwell's Equations

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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
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Vector Algebra: Method of Components01:08

Vector Algebra: Method of Components

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It is cumbersome to find the magnitudes of vectors using the parallelogram rule or using the graphical method to perform mathematical operations like addition, subtraction, and multiplication. There are two ways to circumvent this algebraic complexity. One way is to draw the vectors to scale, as in navigation, and read approximate vector lengths and angles (directions) from the graphs. The other way is to use the method of components.
In many applications, the magnitudes and directions of...
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Cartesian Form for Vector Formulation01:26

Cartesian Form for Vector Formulation

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The Cartesian form for vector formulation is a process to calculate  the moment of force using the position and force vectors. The moment of force is defined as the cross-product of these vectors, making it a vector quantity. The Cartesian form of the position and force vectors involves unit vectors, which can be used to express the cross-product in determinant form.
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相关实验视频

Updated: Jan 8, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

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多模向量单子的多维定制,具有多功能空间对齐结构的多模向量单子.

Zihao Zhang, Xinghao Duan, Yang Zhang

    Optics express
    |December 19, 2025
    PubMed
    概括

    研究人员为时空模式锁定 (STML) 纤维激光器开发了一种新的空间对齐结构 (SAS). 这种SAS允许精确控制多模向量单子,从而实现多种非线性动态和更广泛的带宽脉冲.

    科学领域:

    • 非线性光学是一种非线性光学.
    • 纤维激光技术 纤维激光技术
    • 光学通信是指光学通信的应用.

    背景情况:

    • 多模光纤激光器表现出复杂的动态,阻碍了对单子参数的控制.
    • 之前的系统忽视了矢量单子动态,这是由于偏振依赖的组件.
    • 多模单元的有限应用源于不精确的输出控制.

    研究的目的:

    • 介绍一种定制时空模式锁定 (STML) 脉冲输出参数的方法.
    • 为了能够精确控制多模单子特性和非线性动态.
    • 探索STML光纤激光器中的新型非线性效应.

    主要方法:

    • 引入一个极化独立的空间对齐结构 (SAS),作为一个可和的吸收器,空间过器和减弱器.
    • 调整SAS以调整多模单元属性和STML动态.
    • 对矢量单子动力学及其在脉冲生成中的作用进行实验研究.

    主要成果:

    • 实现可控制的多模式单声特征和多种STML动态 (单声雨,三色单声,超宽带宽频谱脉冲).
    • 演示了第一个多模向量常规单子.
    • 在1.5μm STML激光器中获得了最宽的带宽 (28nm) 和最短的脉冲持续时间 (94 fs).

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    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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    结论:

    • SAS提供了一种在STML光纤激光器中按需定制输出的方法.
    • 矢量单子动态对于生成参数侧带和各种STML脉冲至关重要.
    • 对多功能SAS和多模向量单子的进一步研究可能会揭示新的时空非线性效应.