Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

344
The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
344
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

837
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
837
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

110
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
110
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

275
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
275
Generator Voltage Control01:21

Generator Voltage Control

181
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
181
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

3.1K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
3.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Deep learning prediction of noise-driven nonlinear instabilities in fibre optics.

Nature communications·2025
Same author

Spatial coherence measurement and control in multimode fibers.

Optics express·2025
Same author

Principles and metrics of extreme learning machines using a highly nonlinear fiber.

Nanophotonics (Berlin, Germany)·2025
Same author

Limits of nonlinear and dispersive fiber propagation for an optical fiber-based extreme learning machine.

Optics letters·2025
Same author

Relative intensity noise characterization of supercontinuum generation in graded-index and step-index multimode fibers.

Optics letters·2025
Same author

Intracavity coherent supercontinuum generation via high-order soliton dynamics in a dissipative soliton fiber laser.

Optics express·2025
Same journal

Gaussian-modulated continuous-variable quantum key distribution over 60 km fiber using an integrated silicon photonic receiver.

Optics letters·2026
Same journal

E2E-OCT: end-to-end joint learning model using optical coherence tomography images for vocal cord leukoplakia diagnosis.

Optics letters·2026
Same journal

Holographic generation of panoramic 3D scenes by concave ellipsoidal mirror reflection.

Optics letters·2026
Same journal

Dual-pilot phase recovery with pair-wise maximum-ratio combining for coherent PONs.

Optics letters·2026
Same journal

Mapping the whispering gallery modes of a CaF<sub>2</sub> disk resonator with half-tapered fibers to estimate the fundamental mode volume.

Optics letters·2026
Same journal

Quantitative estimation of deep-subwavelength scale via dark-field scattering axial energy concentration decay profiles.

Optics letters·2026
查看所有相关文章

相关实验视频

Updated: Jul 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.0K

使用基因算法优化的福里埃域脉冲塑造量身定制的超级连续生成.

Mathilde Hary, Lauri Salmela, Piotr Ryczkowski

    Optics letters
    |September 1, 2023
    PubMed
    概括
    此摘要是机器生成的。

    我们展示了一种新方法,用于精确控制高非线性纤维中的超连续生成,使用里埃域脉冲塑造和遗传算法. 这种技术允许在广泛的波长范围内进行用户可选择的光谱增强.

    更多相关视频

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

    Published on: May 30, 2014

    14.6K
    In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
    09:39

    In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

    Published on: May 27, 2013

    12.4K

    相关实验视频

    Last Updated: Jul 17, 2025

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    9.0K
    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

    Published on: May 30, 2014

    14.6K
    In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
    09:39

    In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

    Published on: May 27, 2013

    12.4K

    科学领域:

    • 非线性光学是一种非线性光学.
    • 量子光学就是一个量子光学.
    • 光纤光学是指光纤的使用.

    背景情况:

    • 对各种应用来说,超级连续的生成至关重要,但精确的光谱控制仍然具有挑战性.
    • 传统方法往往缺乏用户定义的光谱造型的灵活性.
    • 五秒激光脉冲塑造为量身定制的光学光谱提供了潜力.

    研究的目的:

    • 开发一种用于生成光谱量身定制的超级连续的方法.
    • 为了证明用户可选择的光谱增强在1550-2000nm范围内.
    • 为了优化光谱造型,使用遗传算法进行增强控制.

    主要方法:

    • 使用富里埃域脉冲塑造生成一个光谱定制的超级连续体.
    • 在高度非线性纤维中注入femtosecond脉冲.
    • 通过遗传算法控制和优化光谱造型.
    • 用户可选择的光谱通道选择 (1-5 nm带宽) 的演示.

    主要成果:

    • 在1550-2000nm波长范围内实现了用户可选择的光谱增强.
    • 已证明的光谱增强因子为5-20 (1550-1800 nm),在2000 nm左右超过160.
    • 通过使用遗传算法,成功地同时增强了多达四个光谱通道.

    结论:

    • 富里埃域脉冲塑造与遗传算法相结合,可以精确控制超级连续生成.
    • 这种方法使灵活和用户定义的光谱定制能够用于先进的光学应用.
    • 展示的技术显著增强了高度非线性纤维的光谱特征.