RegisterGaussian beam, Gaussian functionAssume a laser beam of the basic mode TEM00 , which leaves the source as parallel (equiphase surface is planar and perpendicular to the direction of propagation, to the optical axis). Although the beam is not intentionally modulated, transversal field distribution is not constant. Considering the above-mentioned mode, the maximum intensity is in the axis of the beam, and the intensity decreases towards margin of the beam following Gaussian function: | . | |
Here, r is radial distance from the axis of the beam, and the function is depicted in the figure. Beam, which is characteristic by the above-described transversal Gaussian distribution of field intensity, is called Gaussian beam. | Gaussian beam, Gaussian function |
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