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Related Concept Videos

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

Time and frequency -Domain Interpretation of Phase-lag Control

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 finite,...

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Published on: August 12, 2013

Binary phase plates cannot improve laser beam quality.

A E Siegman

    Optics Letters
    |October 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Binary phase plates do not improve the M(2) beam quality factor for laser beams, despite claims. Their effectiveness for power-in-the-bucket measurements is also questionable.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Binary phase plates are proposed for enhancing far-field brightness in laser arrays.
    • Applications include antiphased laser arrays and higher-order mode waveguide lasers.

    Purpose of the Study:

    • To investigate the actual impact of binary phase plates on laser beam quality.
    • To evaluate their effectiveness beyond theoretical suggestions.

    Main Methods:

    • Analysis of the second-moment-based beam quality factor M(2).
    • Theoretical evaluation of power-in-the-bucket metrics.

    Main Results:

    • Binary phase plates do not improve the M(2) beam quality factor.
    • The utility of these plates from a power-in-the-bucket perspective is uncertain.

    Conclusions:

    • Binary phase plates offer no improvement to the standard M(2) beam quality metric.
    • Their practical benefit for laser beam shaping requires further critical assessment.