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Related Concept Videos

Phase Changes01:19

Phase Changes

Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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...
Phase Diagram01:19

Phase Diagram

The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
Phase Diagram01:24

Phase Diagram

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...

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Related Experiment Video

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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

Contouring by phase conjugation.

Y Fainman, E Lenz, J Shamir

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optical method for high-sensitivity height and phase contouring using phase conjugation. This technique simplifies complex calculations through a new operator algebra, enhancing precision in optical measurements.

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    Area of Science:

    • Optics and Photonics
    • Holography
    • Metrology

    Background:

    • Accurate height and phase contouring are crucial in various scientific and industrial applications.
    • Traditional methods can be limited by sensitivity and complexity.

    Purpose of the Study:

    • To develop a high-sensitivity method for height and phase contouring.
    • To simplify the mathematical procedures involved in optical metrology.

    Main Methods:

    • Superposition of a wavefront with its complex conjugate.
    • Reconstruction of Fourier transform holograms using optical systems.
    • Application of a novel operator algebra for mathematical simplification.

    Main Results:

    • Achieved high sensitivity in height and phase contouring.
    • Demonstrated effective phase conjugation through hologram reconstruction.
    • Simplified complex calculations using the new operator algebra.

    Conclusions:

    • The proposed method offers a significant advancement in optical contouring techniques.
    • The novel operator algebra streamlines the process, making it more accessible and efficient.