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IZAK Scientific · Free engineering tool

Gaussian Beam Calculator

Enter the wavelength, waist and beam quality. Get the Rayleigh range, divergence and beam size at any distance, then check how the spot will sit on a beam profiler sensor.

Beam

1.0 is an ideal Gaussian. Typical: 1.05–1.3 for good single-mode lasers.


Sensor

Beam diameter at z (1/e²)
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Rayleigh range zR
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Full divergence angle 2θ
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FWHM diameter at z
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Wavefront radius R(z)
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Peak intensity at z
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Beam envelope

Shaded band: ±w(z). Dashed lines: ±zR, where the beam area doubles. Marker: your distance z.

On the sensor at z

Measure it, don’t estimate it

Real beams drift from the ideal. A camera-based beam profiler shows the true diameter, centroid, ellipticity and profile, live, to ISO 11146.

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