Knife-Edge Beam Profile calculator
1/e² Gaussian beam radius from 10–90% (or 16–84%) knife-edge sweep.
Category: Optomechanics
Formula: w = Δx / k (k = √2·erf⁻¹(1 − 2p): k₁₀₋₉₀ = 1.2816, k₁₆₋₈₄ = 0.9945)
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Δx (10→90) | dx | µm | 100 |
| Δx (16→84) | dx2 | µm | 64 |
Result with the default inputs
- w (10–90): 78.0304 µm
- w (16–84): 64.3567 µm
- FWHM (10–90): 91.8738 µm
Open it with your own values: put each input in the address as a parameter, for example /calculators/knife-edge-beam-profile?dx=100. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Beam diameter, Knife-edge