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Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

487
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...
487
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

426
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
426
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

593
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...
593

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Updated: Feb 25, 2026

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Efficient phase-locking of 37 fiber amplifiers by phase-intensity mapping in an optimization loop.

David Kabeya, Vincent Kermène, Marc Fabert

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    |August 10, 2017
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    An innovative iterative process successfully combined laser beams from 37 fiber amplifiers. This method

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    Area of Science:

    • Optics and Photonics
    • Laser Technology

    Background:

    • Fiber laser arrays are crucial for high-power applications.
    • Achieving coherent combination of multiple fiber lasers presents significant challenges.

    Purpose of the Study:

    • To demonstrate a novel iterative process for coherent beam combination.
    • To validate the method's efficiency and speed for large fiber laser arrays.

    Main Methods:

    • Utilized a tiled aperture configuration for 37 fiber amplifiers.
    • Implemented an innovative iterative algorithm for phase control and locking.

    Main Results:

    • Successfully achieved coherent combination of laser beams from 37 fiber amplifiers.
    • Demonstrated high efficiency and rapid phase control.

    Conclusions:

    • The iterative process is highly relevant for phase locking large fiber laser arrays.
    • The method shows promise for scaling up coherent beam combination techniques.