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Diffraction-Limited Laser Spot Size Calculator — result sheet
Estimate the Airy-disk diameter, radius, and area for a circular aperture or focused beam using wavelength and focal geometry.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Airy-disk diameter d = 2.44 λf/D; radius = d/2; disk area = π(d/2)², with λ, f, and D in compatible length units.
The Airy-disk estimate describes the central diffraction-limited spot from a circular aperture. It is a useful optics baseline before real beam quality, aberration, clipping, and alignment are included.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Wavelength — nm; minimum 1.0E-6; maximum 1000000000
- Focal length — mm; minimum 1.0E-6; maximum 1000000000
- Circular aperture diameter — mm; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Wavelength | 532 |
| Focal length | 50 |
| Circular aperture diameter | 10 |
Airy-disk diameter ≈ 6.4904 μm; radius ≈ 3.2452 μm.
Assumptions and limits
- The aperture is circular and the paraxial focal approximation is appropriate.
- Wavelength, focal length, and aperture are converted to metres before calculation.
- The result is a diffraction baseline, not a guarantee of measured spot size or delivered power density.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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