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  2. Laser beam profiler - Wikipedia

    en.wikipedia.org/wiki/Laser_beam_profiler

    A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation path. Since there are many types of lasers— ultraviolet , visible , infrared , continuous wave , pulsed, high-power, low-power—there is an assortment of instrumentation for measuring ...

  3. Airy disk - Wikipedia

    en.wikipedia.org/wiki/Airy_disk

    A circular laser beam with uniform intensity across the circle (a flat-top beam) focused by a lens will form an Airy disk pattern at the focus. The size of the Airy disk determines the laser intensity at the focus.

  4. Gaussian beam - Wikipedia

    en.wikipedia.org/wiki/Gaussian_beam

    The equations below assume a beam with a circular cross-section at all values of z; this can be seen by noting that a single transverse dimension, r, appears.Beams with elliptical cross-sections, or with waists at different positions in z for the two transverse dimensions (astigmatic beams) can also be described as Gaussian beams, but with distinct values of w 0 and of the z = 0 location for ...

  5. Tophat beam - Wikipedia

    en.wikipedia.org/wiki/Tophat_beam

    Tophat beams are named for their resemblance to the shape of a top hat. Due to diffraction, a beam cannot maintain a sharp-edged tophat cross-section for more than a short distance of propagation, and the edges of the distribution will become increasingly fuzzy as the beam propagates forward. [1]

  6. M squared - Wikipedia

    en.wikipedia.org/wiki/M_squared

    The diameter of the multimode beam is then M times that of the embedded Gaussian beam everywhere, and the divergence is M times greater, but the wavefront curvature is the same. The multimode beam has M 2 times the beam area but 1/M 2 less beam intensity than the embedded beam. This holds true for any given optical system, and thus the minimum ...

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