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Related Concept Videos

Zones of Protection01:16

Zones of Protection

In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
Fault Types01:18

Fault Types

When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Three-Phase Circuits01:22

Three-Phase Circuits

AC power distribution systems have three categories: single-phase, two-phase, and three-phase systems. The single-phase circuit, common in residential settings, typically employs a two-wire system connecting a single AC source to various loads. These circuits support standard household appliances operating at 120 volts (V) and 240 V, such as lamps, televisions, and microwaves. The first generators, Niagara Falls hydro plant installed in 1895, were two-phase and designed by Nikola Tesla. The...
Three-Phase Voltages01:30

Three-Phase Voltages

A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...

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Related Experiment Video

Updated: Jun 27, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

High efficiency multilevel phase-type fractal zone plates.

Dong Wu1, Li-Gang Niu, Qi-Dai Chen

  • 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China.

Optics Letters
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

High-efficiency fractal zone plates were rapidly fabricated using femtosecond laser technology. These novel optical elements demonstrate improved imaging and multifocus capabilities, with potential for enhanced diffractive efficiency.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Fractal zone plates offer unique optical properties.
  • Efficient fabrication methods are crucial for advanced optical devices.
  • Femtosecond laser-based techniques enable high-resolution patterning.

Purpose of the Study:

  • To rapidly fabricate high-efficiency phase-type fractal zone plates.
  • To investigate the diffractive efficiency and imaging capabilities of these fractal optical elements.
  • To explore methods for further enhancing diffractive efficiency.

Main Methods:

  • Fabrication of fractal zone plates using femtosecond laser two-photon photopolymerization.
  • Theoretical prediction of maximal diffractive efficiencies via numerical simulation and analytical deduction.
  • Experimental verification of predicted efficiencies and demonstration of imaging properties.

Main Results:

  • Three types of fractal zone plates were fabricated with measured efficiencies of 20.5%, 9.1%, and 13%.
  • Multifocus characteristics and improved imaging ability were demonstrated.
  • A four-level fractal phase lens achieved a record high diffractive efficiency of 37.6%.

Conclusions:

  • Femtosecond laser fabrication is a rapid and effective method for creating high-efficiency fractal zone plates.
  • Fractal zone plates exhibit promising multifocus and imaging performance.
  • Advanced fractal designs, like the four-level lens, significantly enhance diffractive efficiency for optical applications.