²©ÀÖ²ÊƱ Focusability (Gaussian Beam)
For a collimated beam, the diffraction-limited focal spot size of a laser beam depends on its wavelength, the size of the beam at the lens and its M2 value. Use this simple calculator to determine your laser's diffraction-limited focal spot size, assuming an ideal lens without aberrations and a collimated laser beam. If the beam is not collimated, then the full Focal Spot Size Calculator should be used (set p to 0.01 and fill in ¦Ë, fl, ¦È, d).
Check our other laser measurement tools:
• Sensor Finder • ²©ÀÖ²ÊƱ Peak Power Calculator • ²©ÀÖ²ÊƱ Focal Spot Size Calculator • ²©ÀÖ²ÊƱ Power Through Aperture Calculator • ²©ÀÖ²ÊƱ Focusability Calculator
²©ÀÖ²ÊƱ - Ê×Ò³
Wavelength |
(nm) * |
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Lens focal length |
(mm) * |
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Beam diameter (at lens) |
This is the 1/e2 diameter of the Gaussian beam. It's the point at which the power is about 13.5% of the peak power. |
(mm) * |
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M-Squared |
* |
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| ²©ÀÖ²ÊƱ Beam Optics Calculators | How To Calculate ²©ÀÖ²ÊƱ Beam Size | Focusing A Gaussian ²©ÀÖ²ÊƱ Beam: Which Formula To Use? | A Beginner's Guide To ²©ÀÖ²ÊƱ Power Measurement | |||||||